CSS老师授课2-relative

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 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml">
 3 <head>
 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 5 <title>无标题文档</title>
 6 <style type="text/css">
 7 */*针对所有标签起作用*/
 8 {
 9     margin:0px;/*去除所有边距*/
10     padding:0px;/*去除所有间距*/}
11 </style>
12 </head>
13 
14 <body>
15 <br />
16 <br />
17 <br />
18 <br />
19 <br />
20 <br />
21 <br />
22 <br />
23 <br />
24 <br />
25 <br />
26 <br />
27 <br />
28 <br />
29 <br />
30 <br />
31 <br />
32 <br />
33 <br />
34 <br />
35 <br />
36 <br />
37 <br />
38 <br />
39 <br />
40 <br />
41 <br />
42 <br />
43 2<br />
44 
45 <div style="100px; height:100px; border:5px solid blue; background-color:#0F6; top:0px; left:0px; position:absolute; overflow:scroll; ">a<div style="100px; height:100px; border:5px solid blue; background-color:#0F6; top:50px; left:50px; position:absolute;">aa</div></div>
46 
47 
48 
49 </body>
50 </html>