1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title></title> 6 <style> 7 * { 8 margin: 0; 9 padding: 0; 10 } 11 #div1 { 12 width: 200px; 13 height: 200px; 14 background: yellow; 15 } 16 17 #div2 { 18 width: 100px; 19 height: 100px; 20 background: pink; 21 position: relative; 22 left: 50px; 23 top: 50px; 24 } 25 #div3 { 26 width: 50px; 27 height: 50px; 28 background: navajowhite; 29 position: relative; 30 left: 25px; 31 top: 25px; 32 } 33 </style> 34 </head> 35 <body> 36 <div id="div1"> 37 <div id="div2"> 38 <div id="div3"></div> 39 </div> 40 </div> 41 </body> 42 </html>
原文：http://www.cnblogs.com/aoun/p/4887481.html