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html,body{height:100%}为什么还要设html的高度？

1

2

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="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
    html,body{height:100%}
    .parentElement{
        position:relative;
        background-color:aqua;
        width:200px;
        height:50%; 
    }

 .childElement{
     position:absolute;
     top:50%;
     transform:translateY(-50%);
     background-color:blueviolet;
        width:50%; 
        height: 25%;
        margin-left:25%;
 }
    </style>

</head>
<body>
    <div class="parentElement">
    <div class="childElement"></div>
    </div>
    
</body>
</html>

该问题已被官方收录

如何实现在响应式过后的文件对齐

2

2

布局响应式

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

css
@gerrn:#29b078;
@fff:#fff;
@color:#fafafa;

.dfjsb{
  display:flex;
  justify-content:space-between;
  align-items:center;

}

a{
  text-decoration:none;
}

.yui{
  .dfjsb;
  padding:0 2rem;
}

.rty{
  .dfjsb
}

.dfjsa{
  display:flex;
  justify-content:space-around;
  align-items:center;
}

.dfffr{
  display:flex;
  flex-flow:column;
  align-items:center;
  padding-left:1.5em;
  justify-content:center;
}

.dfrr{
  display:flex;
  flex-direction:row-reverse;
  color:@fff;
}

.tac{
  text-align:center;
}

html{
  font-size:62.5%;
  overflow-x: hidden;
}

body{
  margin:0;
  padding:0;
  background:#fafafa;
}

.hdtp{
  .dfjsb;
  padding:0 2rem;
  .hdct{
    color:@gerrn;
  }
  .hdbm{
    .dfjsb;
    padding-right:2rem;
    width:15%;
  }
}

.hdmn{
  .dfrr;
  justify-content:space-between;
  padding:0 2rem;
  background:@gerrn;
  height:7.2rem;
  font-size:1.6vw;
  .hdmnq{
    display:flex;
    flex-flow:row-reverse;
    width:70%;
    padding-right:2rem;
  }
  .hdmnc{
    text-align:center;
    height:7rem;
    line-height:7rem;
    width:8%;
    &:hover{
      border-bottom:3px solid #fff;
    }
  }
}

@media screen and(max-width:1000px){
  .hdmn .hdmnc{
    width:25%;
  }
}

.mnftr{
  margin-top:1.3em;
}

.setting{
  height:3em;
  margin:0 4em 0 24px;
  font-size:1.6em;
  border-bottom:1px solid #ccc;
  a{
    color:green;
  }
}

.text{
  margin:0 64px 0 2em;
  height:2em;
  border-bottom:1px solid #ccc;
  a{
    color:#000;
    &:hover{
      background:green;
      color:#fff;
    }
  }
}


strong{
  display:block;
  height:3em;
  border-bottom:1px solid #ccc;
  margin:0 64px 0 24px;
  font-size:16px;
  text-align:center;
}

.tab{
  width:330px;
  margin-top:1em;
  border:1px solid #ccc;
  img{
    width:90px;
    height:90px;
    margin:1em;
  }
}

.tae{
  width:330px;
  border:1px solid #ccc;
  border-top:0;
  .w200{
    width:180px;
    height:2em;
    border-right:1px solid #ccc;
  }
  b{
    color:red;
  }
  img{
    width:10px;
    height:10px;
  }
}

.boa{
  border:1px solid #ccc;
  .w145{
    text-align:center;
    width:130px;
    border-right:1px solid #ccc;
  }
  .w199{
    width:187px;
    border-bottom:1px solid #ccc;
  }
}

.dsf{
  display:flex;
  justify-content:space-between;
  margin:0 2em;
}



.ttt{
  font-size:12px;
  width:330px;
  border:1px solid #ccc;
}

.footer-top{
  background:@gerrn;
  color:@fff;
}

.footer-center{
  padding-right:.5em;
  border-right:1px solid @fff;
}

.footer-bottom{
  padding-bottom:.3em;
  height:1.3rem;
  &:hover{
    border-bottom:2px solid @fff;;
  }
}

@media screen and (max-width:1000px){
  .yui{
    display:flex;
    flex-flow:column;
  }
}
@media screen and (max-width:1000px){
  .dsf{
    display:flex;
    flex-flow:column;
    width:100%;
  }
  .text{
    margin:0;
  }
  strong{
    margin:0;
    display: block;
    height: 3em;
    border-bottom: 1px solid #ccc;
    font-size: 16px;
    text-align: center;
  }

  .hdmn{
    padding:0;
  }
.setting{
  margin:0;
}
  .center{
    margin:0 auto;
  }

  .tab{
    width:90%;
  }

  .tae{
    width:90%;
  }

  .boa{
    width:90%;
  }

  .ttt{
    width:90%;
  }
}
.summary{
  display: flex;
  flex-flow: column;
  justify-content: center;
  align-items: center;
  opacity: 0;
  position: absolute;
  top: 0;
  left: 0;
  width: 280px;
  height: 310px;
  transition: ALL 3s ease-in-out;
}
.re{
   display:block;
  position:relative;
  top:0;
 }
.summary:hover{
  display:block;
  opacity: .8;
  background:black;
  color: white;
  transform: rotate(360deg);
  padding: 0 2rem;
  margin: 1rem 2rem 0 2px;
}

@media screen and (max-width:1000px){
  .summary{
    width:83%;
  }
}
@media screen and (max-width:600px){
  .summary{
    width:73%;
  }
}

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怎么用PS一键切图?

4

2

PhotoShop

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 图片

class="cursor-pointer"> 文本

该问题已被官方收录

怎么修改bootstrap框架导航栏的默认link样式

2

2

bottstrap

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<nav>
    <div class="container">
        <ul class="nav">
            <li class="nav-item">
                <a class="nav-link" href="#">首页</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">在线定制</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">标准箱</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">品质保障</a>
            </li>
        </ul>
    </div>
</nav>

CSS部分

/*导航栏*/
nav{
    height: 8rem;
    background: #f9f9f9;
}
nav>.container{
    height: 100%;
}
.nav{
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}
.nav-link{
    background-color: #fff;
    padding: 1rem 1.4rem;
    margin: 0 1rem;
    border-radius: 2px;
    color: #000;
}
.nav-item:hover .nav-link{
    background: #007bff;
    color: #fff;
}

该问题已被官方收录

如何用纯CSS制作轮播图，不能使用框架

2

2

轮播

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

css

该问题已被官方收录

用bottstrap布局到footer时竖向排列的问题。

1

2

bottstrap

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<footer>
    <div class="base">
        <div class="container">
            <div class="row">
                <div class="col-xs-12 col-md-12 col-lg-12 page">
                    <div class="gap"><a href="#" style="border: 0;">技能树-改变你我</a><br><br><br><a href="#">关于我们</a><a
                            href="#">联系我们</a><a href="#" style="border: 0;">合作企业</a></div>
                    <div class="second"><a href="#">旗下网站</a><br><br><a href="#">草船云孵化器</a><a href="#">最强IT特训营</a><br><a
                            href="#">葡萄藤轻游戏</a><a href="#">桌游精灵</a></div>
                    <div class="gapp"><a href="#">微信公众平台</a>
                        <p><img src="images/task8-17.jpg" alt="二维码"></p></div>
                </div>
            </div>
        </div>
    </div>
</footer>

该问题已被官方收录

所在地下拉菜单使用了bootstrap下拉菜单样式，点击时无法实现下拉？

2

2

bootstrap

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<div class="dropdown-line ">
    <div class="dropdown-1">
      <button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-haspopup="true"
        aria-expanded="true">
        所在地
        <span class="caret"></span>
      </button>
      <ul class="dropdown-menu" aria-labelledby="dropdownMenu1">
        <li>
          <a href="#">Action</a>
        </li>
        <li>
          <a href="#">Another action</a>
        </li>
        <li>
          <a href="#">Something else here</a>
        </li>
        <li role="separator" class="divider"></li>
        <li>
          <a href="#">Separated link</a>
        </li>
      </ul>
    </div>

该问题已被官方收录

“如何学习”栏-文字自适应居中

1

2

居中

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<div class="col-sm-6 col-md-3 stu-colum">
          <div class="stu-left">1</div>
          <div class="stu-right">
            <img src="img/arrow.png" alt="rightarrow">
          </div>
          <div class="stu-md"><span>匹配你现在的个人情况，寻找适合自己的岗位</span></div>
        </div>

该问题已被官方收录

option如何居中

1

2

居中表单元素下拉菜单

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

option {
    font-weight: normal;
    display: block;
    white-space: pre;
    min-height: 1.2em;
    padding: 0px 2px 1px;
    text-align:center;
}

该问题已被官方收录

用sass转译出的css文件媒体查询达到分辨率条件不起作用，还是原来的css样式

0

2

Sass

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

@media screen and (max-width: 768px) {
  .footer_box, .footer .footer_box-right {
    display: grid;
    width: 100%; }
  .footer .footer_box-right {
    float: none; } }

@media screen and (max-width: 768px){
  
    .footer_box{
      display: grid;
      width:100%;
    }
    .footer_box-right{
      float:none;
    }
 
}

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