1 <!DOCTYPE html>
2 <html>
3 <head lang="en">
4 <meta charset="UTF-8">
5 <title></title>
6 <style type="text/css">
7
8 div{
9 border-style: solid;
10 border-color: blueviolet;
11 border-width: 2px;
12 height: 200px;
13
14 //塌缩collapse
15 }
16 </style>
17 </head>
18 <body>
19
20 <div></div>
21 </body>
22 </html>