| 1234567891011121314151617181920212223242526272829303132333435363738394041 |
- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <title>Document</title>
- <style>
- *{
- margin: 0;
- padding: 0;
- }
- html{
- font-size: 20px;
- }
- /* rem 相对于根元素（html）的字体大小 */
- .box{
- width: 10rem;
- height: 10rem;
- background-color: red;
- }
- .div1{
- font-size: 30px;
- }
- /* em 相对于本身 及 祖先元素的font-size */
- .div2{
- font-size: 20px;
- width: 10em;
- height: 10em;
- background-color: blue;
- }
- </style>
- </head>
- <body>
- <div class="box"></div>
- <div class="div1">
- <div class="div2"></div>
- </div>
- </body>
- </html>
|
