通过CSS3，实现元素覆盖效果_html/css_WEB-ITnose

  <meta charset="UTF-8">  <title></title>  <style>    #d1{      height: 100px;      position: relative;      width: 100px;      overflow: hidden;    }    #d1:hover > #d3{      transition: transform 0.5s ease;      transform: translateY(-100%);    }    #d2{      background: red;      height: 100px;      width: 100px;    }    #d3{      color: white;      background: #111;      height: 100px;      opacity: 0.6;      width: 100px;    }  </style>  <div id="d1">    <div id="d2"></div>    <div id="d3"></div>  </div>