IT修真院·坑乎 | Java(后端),CSS(前端),JavaScript(前端),PM(产品经理),UI(交互设计),QA(测试),Android(安卓APP),iOS(苹果APP),OP(运维),Python(后端)日常在线问答学习平台

该问题已被官方收录

rgba和opacity有什么区别

1

透明度

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

 position: fixed;
    right: -25.5rem;
    opacity: 0;

height: 6.45rem;
    width: 100%;
    position: fixed;
    bottom: 0;
    z-index: 1;
    background:rgba(153,223,240,.4);
    padding: 1.2rem 0.9rem 0.95rem 0rem;
    text-align: center;

该问题已被官方收录

关于空格表示

2

1

占位符

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

&  nbsp;	        &   #160; 不断行的空白（1个字符宽度）
&  ensp; 	&   #8194;半个空白（1个字符宽度）
&  emsp;	&  #8195;	一个空白（2个字符宽度）
&  thinsp; 	&  #8201;	窄空白（小于1个字符宽度）

该问题已被官方收录

雪碧图问题

1

雪碧图

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<div class="dropdown">
                <span class="role">水民</span>
                <span class="number">1号</span>
                <ul class="dropdown-content">
                    <li class="knife"></li>
                    <li class="find"></li>
                    <li class="sight"></li>
                    <li class="cure"></li>
                </ul>
            </div>

该问题已被官方收录

图片隐藏后鼠标点击为什么显示不了。

1

属性

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 图片

class="cursor-pointer"> 文本

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0,
     <!--minimum-scale=0.5, maximum-scale=2.0, user-scalable=yes"/>
    <script src="//cdn.bootcss.com/jquery/1.11.3/jquery.min.js"></script>
    <link rel="stylesheet" href="//cdn.bootcss.com/bootstrap/3.3.5/css/bootstrap.min.css">
    <script src="//cdn.bootcss.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
    <link rel="stylesheet" href="../css/task7.2.css">
</head>
<body>
<div class="wrap">
    <div class="head">
      <img src="../img/task7.1.1.png" class="catalogue" alt="">
      <span class="vote">投票</span>
      <img src="../img/task7.1.2.png" class="wrong" alt="">
     </div>
    <div class="make">
      <p>发表讨论结果，大家请投票</p>
    </div>
    <div class="makk">
    </div>
      <p class="cilck">点击票数最多人的头像</p>
    <div class="olk">
      <div class="center">
        <div class="cox">
           <p class="iu">水民</p>
           <p class="ui">一号</p>
            <div class="mxc">
                <img src="../img/task7.12.png" class="con1" alt="">
                <img src="../img/task7.11.png" class="con2" alt="">
                <img src="../img/task.7.13.png" class="con3" alt="">
                <img src="../img/task7.10.png" class="con4" alt="">
            </div>
        </div>
        <div class="cox">
            <P class="iu">水民</P>
            <p class="ui">2号</p>
            <div class="mxc">
                <img src="../img/task7.12.png" class="con1" alt="">
                <img src="../img/task7.11.png" class="con2" alt="">
                <img src="../img/task.7.13.png" class="con3" alt="">
                <img src="../img/task7.10.png" class="con4" alt="">
            </div>
        </div>
        <div class="cox">
            <p class="iu">警察</p>
            <p class="ui">3号</p>
            <div class="mxc">
                <img src="../img/task7.12.png" class="con1" alt="">
                <img src="../img/task7.11.png" class="con2" alt="">
                <img src="../img/task.7.13.png" class="con3" alt="">
                <img src="../img/task7.10.png" class="con4" alt="">
            </div>
        </div>
        <div class="cox">
            <p class="iu">法官</p>
            <p class="ui">4号</p>
            <div class="mxc">
                <img src="../img/task7.12.png" class="con1" alt="">
                <img src="../img/task7.11.png" class="con2" alt="">
                <img src="../img/task.7.13.png" class="con3" alt="">
                <img src="../img/task7.10.png" class="con4" alt="">
            </div>
        </div>
        <div class="cox">
            <p class="iu">狙击手</p>
            <p class="ui">5号</p>
            <div class="mxc">
                <img src="../img/task7.12.png" class="con1" alt="">
                <img src="../img/task7.11.png" class="con2" alt="">
                <img src="../img/task.7.13.png" class="con3" alt="">
                <img src="../img/task7.10.png" class="con4" alt="">
            </div>
        </div>
        <div class="cox">
            <p class="iu">医生</p>
            <p class="ui">6号</p>
            <div class="mxc">
                <img src="../img/task7.12.png" class="con1" alt="">
                <img src="../img/task7.11.png" class="con2" alt="">
                <img src="../img/task.7.13.png" class="con3" alt="">
                <img src="../img/task7.10.png" class="con4" alt="">
            </div>
        </div>
        <div class="cox">
            <p class="iu">杀手</p>
            <p class="ui">7号</p>
            <div class="mxc">
                <img src="../img/task7.12.png" class="con1" alt="">
                <img src="../img/task7.11.png" class="con2" alt="">
                <img src="../img/task.7.13.png" class="con3" alt="">
                <img src="../img/task7.10.png" class="con4" alt="">
            </div>
        </div>
        <div class="cox">
            <p class="iu">水民</p>
            <p class="ui">8号</p>
            <div class="mxc">
                <img src="../img/task7.12.png" class="con1" alt="">
                <img src="../img/task7.11.png" class="con2" alt="">
                <img src="../img/task.7.13.png" class="con3" alt="">
                <img src="../img/task7.10.png" class="con4" alt="">
            </div>
        </div>
        <div class="cox">
            <p class="iu">水民</p>
            <p class="ui">9号</p>
            <div class="mxc">
                <img src="../img/task7.12.png" class="con1" alt="">
                <img src="../img/task7.11.png" class="con2" alt="">
                <img src="../img/task.7.13.png" class="con3" alt="">
                <img src="../img/task7.10.png" class="con4" alt="">
            </div>
        </div>
        <div class="cox">
            <p class="iu">水民</p>
            <p class="ui">10号</p>
            <div class="mxc">
                <img src="../img/task7.12.png" class="con1" alt="">
                <img src="../img/task7.11.png" class="con2" alt="">
                <img src="../img/task.7.13.png" class="con3" alt="">
                <img src="../img/task7.10.png" class="con4" alt="">
            </div>
        </div>
        <div class="cox">
            <p class="iu">水民</p>
            <p class="ui">11号</p>
            <div class="mxc">
                <img src="../img/task7.12.png" class="con1" alt="">
                <img src="../img/task7.11.png" class="con2" alt="">
                <img src="../img/task.7.13.png" class="con3" alt="">
                <img src="../img/task7.10.png" class="con4" alt="">
            </div>
        </div>
        <div class="cox">
            <p class="iu">水民</p>
            <p class="ui">12号</p>
            <div class="mxc">
                <img src="../img/task7.12.png" class="con1" alt="">
                <img src="../img/task7.11.png" class="con2" alt="">
                <img src="../img/task.7.13.png" class="con3" alt="">
                <img src="../img/task7.10.png" class="con4" alt="">
            </div>
        </div>
      </div>
     </div>
    <footer class="vc">
        <button>投死</button>
    </footer>
</div>
</body>
</html>
*{
    margin: 0;
    padding: 0;
}
.head{
    width: 100%;
    height: 14.59vw;
    background: #29bde0;
}
.catalogue{
    width: 6.093vw;
    height: 5.25vw;
    margin-top: 4.78vw;
    margin-left: 3.59vw;
}
.wrap{
    background: #29bde0;
}
.vote{
    position: absolute;
    margin-left: 38vw;
    font-size: 4vw;
    color: #ffffff;
    margin-top: 5vw;
}
.wrong{
    width: 3.78vw;
    margin-left: 34.31vw;
    margin-top: 6vw;
    margin-right: 4vw;
    float: right;
}
.make{
    width: 100%;
    background: #b9e9f5;
    height: 12.65vw;
}
.make p{
    margin-left: 7.5vw;
    font-size: 3vw;
    padding-top: 4.8vw;
}
.makk{
    width: 0;
    height: 0;
    margin-left: 11.25vw;
    border-width: 2vw;
    border-style: solid;
    border-color: #b9e9f5 transparent transparent transparent;
}
.cilck{
    color: #ffffff;
    font-size: 3vw;
    margin-left: 11.40vw;
}
.olk{
  margin-left: 2vw;
    margin-bottom: 16.5vw;
}
.center{
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    list-style: none;
    padding: 0;
}
.cox{
    height: 25vw;
    width: 25vw;
    margin-right: 3vw;
    margin-bottom: 8vw;
    font-size: .17rem;
    text-align: center;
    border: 1vw solid white;
}
.iu{
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 70%;
    margin: 0;
    color: #565656;
    background-color: #f5c97b;
    font-size: 3vw;

}
.ui{
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 30%;
    margin: 0;
    background-color: #83b09a;
    font-size: 3vw;
}
.mxc{
    margin-top: 2vw;
}
.con1{
    width: 3vw;
}
.con2{
    width: 3vw;
}
.con3{
    width: 3vw;
}
.con4{
    width: 3vw;
}
.vc{
    position: fixed;
    bottom: 0;
    padding: 1vw;
    width: 100%;
    height: 17vw;
    text-align: center;
    color: #fff;
    background-color: #29bde0;
}
.vc button{
    border: none;
    width: 80%;
    height: 9vw;
    background-color: #fbb435;
    margin-top: 5vw;
    font-size: 6vw;
}
.mxc img{
    margin-top: 4vw;
    display: none;
}
.mxc img:hover{
    display: block;
}

该问题已被官方收录

bootstrap如何引用cdn

1

bottstrap

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

这里需要下载吗，下载了都是些什么东西

该问题已被官方收录

关于居中的方式，如何在不使用flex和文本居中的方式情况下让它居中

1

居中

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link rel="stylesheet" type="text/css" href="./task7-2.css">
</head>

<body>
    <header>
        <!-- 头部 -->
        <button class="thb">
            <!-- The head box头部盒子缩写 -->
            <div class="itb"></div>
            <!-- 左边按钮Inside the button的缩写 -->
        </button>
        <span class="vote">投票</span>
        <!-- 中间文字 -->
        <button class="rb">
            <!-- 右边关闭按钮外部盒子right-box缩写 -->
            <div class="icon_false"></div>
            <!-- 右边关闭按钮 -->
        </button>
    </header>
    <main>
        <!-- 中间 -->
        <div class="pb">
            <!-- 上面的播放选项盒子play box缩写 -->
            <span class="vw">发言讨论结束，大家请投票</span>
            <!-- Vote words投票文本的缩写 -->
            <audio autoplay="autoplay">
                <!-- 音频播放器 -->
                <source src="./css-7/task7/财富自由.mp3.mp3">
            </audio>
            <div class="rd">
                <!-- roundness圆形的缩写 -->
                <div class="tg"></div>
                <!-- triangle三角形的缩写 -->
            </div>
        </div>
        <div class="st"></div>
        <!-- Small triangle小三角形 -->
        <span class="hint">点击得票数最多人的头像</span>
        <!-- 页面说明文字 -->
        <div>
            <div class="oll">
                <button class="choice">
                    <!-- 第一个选项盒子 -->
                    <span class="status">水民</span>
                    <span class="number">1号</span>
                    <ul class="dropdown-content ">
                        <li class="one"></li>
                        <li class="two"></li>
                        <li class="three"></li>
                        <li class="four"></li>
                    </ul>
                </button>
                <button class="choice">
                    <!-- 第一个选项盒子 -->
                    <span class="status">水民</span>
                    <span class="number">1号</span>
                    <ul class="dropdown-content ">
                        <li class="one"></li>
                        <li class="two"></li>
                        <li class="three"></li>
                        <li class="four"></li>
                    </ul>
                </button>
                <button class="choice">
                    <!-- 第一个选项盒子 -->
                    <span class="status">水民</span>
                    <span class="number">1号</span>
                    <ul class="dropdown-content ">
                        <li class="one"></li>
                        <li class="two"></li>
                        <li class="three"></li>
                        <li class="four"></li>
                    </ul>
                </button>
                <button class="choice">
                    <!-- 第一个选项盒子 -->
                    <span class="status">水民</span>
                    <span class="number">1号</span>
                    <ul class="dropdown-content ">
                        <li class="one"></li>
                        <li class="two"></li>
                        <li class="three"></li>
                        <li class="four"></li>
                    </ul>
                </button>
                <button class="choice">
                    <!-- 第一个选项盒子 -->
                    <span class="status">水民</span>
                    <span class="number">1号</span>
                    <ul class="dropdown-content ">
                        <li class="one"></li>
                        <li class="two"></li>
                        <li class="three"></li>
                        <li class="four"></li>
                    </ul>
                </button>
                <button class="choice">
                    <!-- 第一个选项盒子 -->
                    <span class="status">水民</span>
                    <span class="number">1号</span>
                    <ul class="dropdown-content ">
                        <li class="one"></li>
                        <li class="two"></li>
                        <li class="three"></li>
                        <li class="four"></li>
                    </ul>
                </button>
                <button class="choice">
                    <!-- 第一个选项盒子 -->
                    <span class="status">水民</span>
                    <span class="number">1号</span>
                    <ul class="dropdown-content ">
                        <li class="one"></li>
                        <li class="two"></li>
                        <li class="three"></li>
                        <li class="four"></li>
                    </ul>
                </button>
                <button class="choice">
                    <!-- 第一个选项盒子 -->
                    <span class="status">水民</span>
                    <span class="number">1号</span>
                    <ul class="dropdown-content ">
                        <li class="one"></li>
                        <li class="two"></li>
                        <li class="three"></li>
                        <li class="four"></li>
                    </ul>
                </button>
                <button class="choice">
                    <!-- 第一个选项盒子 -->
                    <span class="status">水民</span>
                    <span class="number">1号</span>
                    <ul class="dropdown-content ">
                        <li class="one"></li>
                        <li class="two"></li>
                        <li class="three"></li>
                        <li class="four"></li>
                    </ul>
                </button>
                <button class="choice">
                    <!-- 第一个选项盒子 -->
                    <span class="status">水民</span>
                    <span class="number">1号</span>
                    <ul class="dropdown-content ">
                        <li class="one"></li>
                        <li class="two"></li>
                        <li class="three"></li>
                        <li class="four"></li>
                    </ul>
                </button>
                <button class="choice">
                    <!-- 第一个选项盒子 -->
                    <span class="status">水民</span>
                    <span class="number">1号</span>
                    <ul class="dropdown-content ">
                        <li class="one"></li>
                        <li class="two"></li>
                        <li class="three"></li>
                        <li class="four"></li>
                    </ul>
                </button>
                <button class="choice">
                    <!-- 第一个选项盒子 -->
                    <span class="status">水民</span>
                    <span class="number">1号</span>
                    <ul class="dropdown-content ">
                        <li class="one"></li>
                        <li class="two"></li>
                        <li class="three"></li>
                        <li class="four"></li>
                    </ul>
                </button>
                <button class="choice">
                    <!-- 第一个选项盒子 -->
                    <span class="status">水民</span>
                    <span class="number">1号</span>
                    <ul class="dropdown-content ">
                        <li class="one"></li>
                        <li class="two"></li>
                        <li class="three"></li>
                        <li class="four"></li>
                    </ul>
                </button>
                <button class="choice">
                    <!-- 第一个选项盒子 -->
                    <span class="status">水民</span>
                    <span class="number">1号</span>
                    <ul class="dropdown-content ">
                        <li class="one"></li>
                        <li class="two"></li>
                        <li class="three"></li>
                        <li class="four"></li>
                    </ul>
                </button>
                <button class="choice">
                    <!-- 第一个选项盒子 -->
                    <span class="status">水民</span>
                    <span class="number">1号</span>
                    <ul class="dropdown-content ">
                        <li class="one"></li>
                        <li class="two"></li>
                        <li class="three"></li>
                        <li class="four"></li>
                    </ul>
                </button>
            </div>
        </div>
    </main>
    <footer>
        <!-- 底部盒子 -->
        <div class="yu">
                <a href="./task7-3.html">投死</a>
        </div>
      
    </footer>
</body>

</html>
html {
    font-size: 62.5%;
}

/* 页面设置样式 */
body {
    margin: 0;
    font-size: 1.6rem;
}

/* 中心样式设置 */
header {
    display: flex;
    justify-content: space-between;
    top: 0;
    height: 4.8rem;
    background-color: #29BDE0;
    position: fixed;
    width: 100%;
    z-index: 1;
}

/* 头部样式设置 */
.thb {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: auto 1.15rem;
    width: 2rem;
    height: 2rem;
    padding: 3px;
    border: 1.5px solid white;
    background-color: #29BDE0;
    outline: none;
}

/* 左边按钮外部盒子样式 */
.itb {
    width: 4rem;
    height: 1.5px;
    padding: 4px 0;    
    border: 1px solid white;
    border-top: 1.5px solid white;
    border-bottom: 1.5px solid white;
    border-left: 0;
    border-right: 0;
    background-clip: content-box;
    background-color: white;
}

/* 左边按钮样式 */
.vote {
    font-size: 17px;
    color: white;
    margin: auto;
}

/* 中间文字样式 */
.rb {
    background-color: #29BDE0;
    border: 0;
}

/* 右边关闭按钮外部盒子样式 */
.icon_false {
    display: inline-block;
    width: 20px;
    height: 2px;
    background: white;
    line-height: 0;
    font-size: 0;
    vertical-align: middle;
    -webkit-transform: rotate(45deg);
}

/* 右边关闭按钮 */

.icon_false:after {
    content: '/';
    display: block;
    width: 20px;
    height: 2px;
    background: white;
    -webkit-transform: rotate(-90deg);
}

/* 关闭按钮样式 */
main {
    margin-bottom: 5rem;
    background-color: #29BDE0;
}

/* 中间部分样式 */
.pb {
    display: flex;
    height: 4.1rem;
    background-color: #b9e9f5;
    padding-top: 4.8rem;
    justify-content: space-between;
}

/* 上面的播放选项盒子play box缩写样式  */
.vw {
    padding: 1.3rem 0;
    padding-left: 2.3rem;
    font-size: 13px;
}

/* Vote words投票文本的缩写样式 */

.rd {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.6rem;
    height: 2.6rem;
    background-color: #FBB435;
    border-radius: 50%;
    margin: auto 1rem;
}

/* 圆形的缩写样式 */
.tg {
    width: 0;
    height: 0;
    border-width: 8px;
    border-right-width: 0px;
    border-style: solid;
    border-color: transparent transparent transparent white;
    margin-left: 10%;
}

/* 三角形缩写样式 */
.st {
    width: 0;
    height: 0;
    border-width: 10px;
    border-style: solid;
    border-color: #b9e9f5 transparent transparent transparent;
    margin-left: 3.55rem;
}

/* 下边小三角形样式 */
.hint {
    color: white;
    margin-left: 3.6rem;
}

/* 页面说明文字样式 */

.choice {
    width: 28.9%;
    height: 28.9vw;
    padding: 0;
    margin: 1rem .6% 8.3vw 2.5%;
    border: 3px solid #FFFFFF;
    background: #F5C97B;
    outline: none;
}

/* 第一个选项盒子 */

.status {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 75%;
    color: #565656;
    font-size: 15px;
}

/* 游戏身份样式 */
.number {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 25%;
    font-size: 11.5px;
    color: white;
    background-color: #83B09A;
}

/* 游戏号码样式 */

.dropdown-content {
    display: none;
    padding: 0;
}

/* 下拉框盒子样式 */
.one {
    display: inline-block;
    width: 4.5vw;
    height: 4.5vw;  
    background: url(./css_sprite2s.png) no-repeat;
    background-position: 14.286% 14.286%;
    background-size: 333.33%;
}

/* 下拉框第一张图片样式 */
.two {
    display: inline-block;
    width: 4.5vw;
    height: 4.5vw;
    background: url(./css_sprite2s.png) no-repeat;
    background-position: 85.714% 14.286%;
    background-size: 333.33%;
}

/* 下拉框第二张图片样式 */
.three {
    display: inline-block;
    width: 4.5vw;
    height: 4.5vw;
    background: url(./css_sprite2s.png) no-repeat;
    background-position: 14.286% 85.714%;
    background-size: 333.33%;
}

/* 下拉框第三张图片样式 */
.four {
    display: inline-block;
    width: 4.5vw;
    height: 4.5vw;
    background: url(./css_sprite2s.png) no-repeat;
    background-position: 85.714% 85.714%;
    background-size: 333.33%;
}

/* 下拉框第四张图片样式 */
.choice:hover .dropdown-content {
    display: inline-block;
    padding: 0;
}

/* 模拟下拉框选项 */
footer {
    position: fixed;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 12%;
    width: 100%;
    bottom: 0;
    background-color: #29BDE0;
}

/* 底部盒子样式 */
.yu{
    display: flex;
    align-items: center;
    justify-content: center;
    width: 94%;
    height: 100%;
    border: 1px solid white;
    border-left: 0;
    border-right: 0;
}
a{
    display: flex;
    justify-content: center;
    align-items: center;
    width: 70%;
    height: 65%;
    border: 0;
    font-size: 20px;
    color: white;
    background-color: #FBB435;
    outline: none;
    text-decoration: none;
}

/* 底部盒子按钮缩写样式 */
.bt {
    font-size: 20px;
    color: white;

该问题已被官方收录

雪碧图横着做的，为什么直接使用雪碧图位置放大会变形。

3

1

属性属性属性属性

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

.killer {
    width: 15px;
    height: 18px;
    background: url(../img/css_sprites.png) no-repeat 0 0;
}

judge {
    width: 4.5vw;
    height: 4.5vw;
    background: url(../img/css_sprites.png) no-repeat -15px 0;
}

该问题已被官方收录

雪碧图能否随自适应页面自动缩放

2

1

雪碧图自适应

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta name="viewport", content="device-width,initial-scale=1.0, manimun-scale=1.0,user-scaleble=no" />
	<title>Document</title>
<style>
.box{
	width:20%;
	height:20vw;
	background-color:blue;
}
i{
	background-image:url(sprite.png);
	display:inline-block;
	width:35px;
	height:35px;
}
</style>
</head>
<body>
<div class="box">
</div>
<div class="sp">
	<i></i>
	<i></i>
	<i></i>
	<i></i>
</div>
</body>
</html>

该问题已被官方收录

怎么设置自适应居中的高度。

4

1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

html{
    font-size: 312.5%;
}
body{
    margin: 0;
    font-size: initial;
    background-color: #29BDE0;
}
header{
    position: fixed;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 .24rem;
    top: 0;
    left: 0;
    right: 0;
    height: .88rem;
    color: #FFFFFF;
    font-size: .34rem;
    z-index: 1;
}
.key-box{
    display: flex;
    justify-content: center;
    align-items: center;
    width: .4rem;
    height: .4rem;
    border: .02rem solid #FFFFFF;
}
.key{
    padding: .1rem 0;
    width: .3rem;
    height: .02rem;
    border-top: .02rem solid #FFFFFF;
    border-bottom: .02rem solid #FFFFFF;
    background: #FFFFFF content-box;
}
.close{
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    height: .6rem;
    width: .6rem;
}
.line-left{
    height: .5rem;
    width: .04rem;
    transform: rotate(45deg);
    background-color: #FFFFFF;
}
.line-right{
    position: absolute;
    height: .5rem;
    width: .04rem;
    transform: rotate(-45deg);
    background-color: #FFFFFF;
}
main{
    position: relative;
}
.speak{
    display: flex;
    justify-content: space-between;
    margin-top: .88rem;
    align-items: center;
    height: .82rem;
    background-color: #B9E9F5;
}
.speak::before{
    position: absolute;
    top: .82rem;
    left: .71rem;
    content: "";
    border-top: .28rem solid #B9E9F5;
    border-left: .14rem solid transparent;
    border-right: .14rem solid transparent;
}
.discuss{
    margin-left: .46rem;
    font-size: .26rem;
    color: #464646;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    letter-spacing: .02rem;
}
.circular{
    display: flex;
    justify-content: center;
    align-items: center;
    margin-right: .17rem;
    height: .52rem;
    width: .52rem;
    border-radius: 50%;
    background-color: #FBB435;
}
.triangle{
    display: inline-block;
    border-left: .26rem solid #FFFFFF;
    border-top: .13rem solid transparent;
    border-bottom: .13rem solid transparent;
}
.click{
    margin-top: .25rem;
    margin-left: .72rem;
    font-size: .24rem;
    letter-spacing: .04rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: #FFFFFF;
}
ul{
    margin: 0;
    padding: .43rem .43rem 0 .43rem;
    list-style: none;
}
li{
    margin: 0;
    padding: 0;
    list-style: none;
}
p {
    margin: 0;
}
.first-row{
    display: flex;
    justify-content: space-between;
}
.square{
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    border: .05rem solid #FFFFFF;
}
.squaree{
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    margin: 0 .71rem;
    
    width: 100%;
    border: .05rem solid #FFFFFF;
}
.civil{
    width: 100%;
    font-size: .3rem;
    color: #565656;
    line-height: 1rem;
    letter-spacing: .04rem;
    white-space: nowrap;
    background-color: #F5C97B;
}
.number{
    width: 100%;
    font-size: .23rem;
    letter-spacing: .02rem;
    white-space: nowrap;
    color: #FFFFFF;
    background-color: #83B09A;

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>task7-2</title>
    <link rel="stylesheet" type="text/css" href="../css/task7-2.css">
</head>
<body>
<header>
     <span class="key-box"><a class="key" href="http://www.jnshu.com/task/1/39/detail//#0"></a></span>
     <span>投票</span>
     <div class="close">
         <span class="line-left"></span>
         <span class="line-right"></span>
    </div>
</header>
<main>
<div class="speak">
    <span class="discuss">发言讨论结束，大家请投票</span>
    <span class="circular">
        <a class="triangle" href="http://www.jnshu.com/task/1/39/detail//#0"></a>
    </span>
</div>
<p class="click">点击得票数最多人的头像</p>
<ul>
    <li class="first-row">
         <div class="square">
             <p class="civil">水民</p>
             <p class="number">1号</p>
         </div>
         <div class="squaree">
             <p>水民</p>
             <p>2号</p>
         </div>
         <div class="square">
             <p>警察</p>
             <p>3号</p>
         </div>
    </li>
</ul>
</main>
</body>
</html>

该问题已被官方收录

图片定位之后下拉显示在背景上面

1

定位

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

css

header {
    position: sticky;
    top:0;
    width: 100%;
    height: .88rem;
    background-color: #5FC0CD;
    line-height: .88rem;
    text-align: center;
    word-spacing: -10px;
}
.dwyz2{
    height: 15px;
    width: 15px;
    position: absolute;
    margin: 6px 0 0 15px;
}


html
<li class="ddbox">
            <img class="dwyz2" src="../img/task6-6.png"/>
            <span class="date">服务日期</span>
            <div class="lll">
                <span class="left">2018-6-12至2018-3-22</span>
                <span class="right">25元/小时
<a class="qwe"></a>
</span>
            </div>
            <img class="dwyz" src="../img/task6-5.png"/>
            <span class="location">北京.通州.果园</span>
        </li>
        <li class="ddbox">
            <img class="dwyz2" src="../img/task6-6.png"/>
            <span class="date">服务日期</span>
            <div class="lll">
                <span class="left">2015-7-5至2017-7-12</span>
                <span class="right">25元/小时
<a class="qwe"></a>
</span>
            </div>
            <img class="dwyz" src="../img/task6-5.png"/>
            <span class="location">北京.通州.果园</span>
        </li>