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1218 box-sizing属性+常用的元素居中方式
一米互联
Original
565 people have browsed it

实例演示box-sizing属性

  1. <!DOCTYPE html>
  2. <html>
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <title>box-sizing的使用</title>
  6.     <style>
  7.         :root{
  8.             font-size:1.25em;
  9.             margin: 0;
  10.             padding:0;
  11.             border: 0;        }
  12.         .box{
  13.             font-size: 1.2rem;  /*24px*/
  14.             width: 10em;        /*240px*/
  15.             height: 10em;       /*240px*/
  16.             border: 1px solid black;
  17.             padding: 0.5em;
  18.             margin: 0 0.2em;
  19.             background: brown;
  20.             box-sizing: border-box;  /*只显示div的宽高像素，其他排除*/
  21.         }
  22.     </style>
  23. </head>
  24. <body>
  25.     <div class="box"></div>
  26. </body>
  27. </html>


实例演示常用的元素居中方式

1.块级元素

  1. .align{
  2.             width: 20em;
  3.             background: rgb(158, 137, 137);
  4.             padding: 5em 0;
  5.         }
  6.         .kuai{
  7.             width: 5em;
  8.             height: 5em;
  9.             background: red;
  10.             margin:0 auto;
  11.         }
  1.     <div class="align">
  2.          <div class="kuai"></div>
  3.     </div>


2.行内元素

  1.         .align {
  2.             width: 15em;
  3.             height: 15em;
  4.             border: 1px solid #000;
  5.             text-align: center;
  6.         }
  8.         .align a {
  9.             line-height: 15em;
  10.         }
  1. <div class="align">
  2.     <a href="http://www.baidu.com">百度一下</a>
  3. </div>


3.行内块元素

  1.         .align {
  2.             width: 20em;
  3.             border: 1px solid #000;
  4.             text-align: center;
  5.         }
  7.         .align img {
  8.             padding: 5em 0;
  9.         }
  1. <div class="align">
  2.         <img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1608456485219&di=181937a0a3cf7128b73ab65298014fc7&imgtype=0&src=http%3A%2F%2Fimg.aiimg.com%2Fuploads%2Fuserup%2F0909%2F2Z64022L38.jpg" width="100"/>
  3. </div>

Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：
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