opacity and z-index
<!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 type='text/css'> body { background: lightyellow; } div { position: absolute; width: 100px; height: 100px; border: 1px solid rgb(200, 200, 200); opacity: 0.7; } 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>