<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en'> <head> <title>z-index</title> <style rel='stylesheet' type='text/css'>div { position: absolute; width: 100px; height: 100px; border: 1px solid rgb(200, 200, 200);}div#one { background: pink; top: 10px; left: 10px; z-index: 4;}div#two { background: lightblue; top: 20px; left: 20px; z-index: 3;}div#three { background: yellowgreen; top: 30px; left: 30px; z-index: 2;}div#four { background: orange; top: 40px; left: 40px; z-index: 1;} </style> </head> <body> <div id='one'></div> <div id='two'></div> <div id='three'></div> <div id='four'></div> </body></html>