04-案例 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>利用类选择器画三个盒子</title>
    <style>
       .red{
           width: 100px;
           height: 100px;
           /* 背景颜色 */
           background-color: red;
       }
       .green{
           width: 100px;
           height: 100px;
           /* 背景颜色 */
           background-color: green;
       }
    </style>
</head>
<body>
    <div class="red"></div>
    <div class="green"></div>
    <div class="red"></div>
</body>
</html>

 

posted @ 2021-08-07 16:59  hycsuper  阅读(25)  评论(0)    收藏  举报