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下拉菜单出不来

布局

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

main {
    background-color: #fafafa;
}

header {
    /* height: 50px;   神坑定高！下拉出不来   */
}

.head-top {
    display: flex;
    justify-content: space-between;
}

/*客服热线*/
.tel {
    margin-top: 0.5%;
    margin-left: 2%;
    margin-top: 3px;
    font-size: 12px;
    color: #29B078;
}

/*微信微博qq图标*/
.head-img {
    margin-right: 2%;
}


.head-img img {
    width: 20px;
    margin-left: 8px;
}


/*加跳转链接*/
.head-text a {
    text-decoration: none;
    color: #ffffff;
}


.carousel-caption .text-4 a {
    text-decoration: none;
    color: #ffffff;
}


.navbar-nav .nav-item .nav-link {
    padding: 15px;
    border: 1px solid #26a26f;
}


.navbar-nav .nav-item .nav-link:hover {
    border-bottom: 1px solid white;
}



/*下面是轮播图的Boot4组件*/

/*这个类，组件里自带了absolute，我这里修改的是文字上移的位置*/
.carousel-caption {
    bottom: 32% !important;
}

/* Make the image fully responsive 让图片全屏展示*/
.carousel-inner img {
    width: 100%;
    height: 100%;
}

.carousel-inner .text {
    text-align: center;
    font-weight: bold;
    font-size: 2.5vw;
    color: #ffffff;
}

.carousel-inner .text-2 {
    text-align: center;
    font-weight: bold;
    font-size: 3vw;
    letter-spacing: 2px;
    color: #ffffff;
}

.carousel-inner .text-2 span {
    font-size: 4.5vw;
    letter-spacing: 2px;
    color: #ffffff;
}


.carousel-inner .text-3 {
    text-align: center;
    font-weight: bold;
    font-size: 6.5vw;
    font-family: MicrosoftJhengHei;
    color: #ffffff;
}


.carousel-inner .text-4 {
    text-align: center;
    font-size: 5.5vw;
    font-family: MicrosoftJhengHei;
    letter-spacing: 2px;
    color: #ffffff;
}


.container.intro {
    margin-bottom: 120px;
}

不使用bootstrap的组件库自己写折叠导航栏；

表单元素

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<div class="row" id="header-second">
                <div class="header-second-one">
                    <img src="./www.jnshu.com.png" alt="">
                </div>
                <div class="header-second-twe">
                    <form>
                        <button type="button"><img src="./heengxian.png" alt=""></button>
                        <input type="radio"name="nav" value=""><a href="./task9-1.html">首页</a>
                        <input type="radio" name="nav" value=""><a href="./task9-1.html">职位</a>
                        <input type="radio"name="nav" value=""><a href="./task9-1.html">推荐</a>
                        <input type="radio" name="nav" value=""><a href="./task9-1.html">首页</a>
                    </form>
                </div>
            </div>
        </div>