background assigns the padding area inside the box to a background color and/or image.
<!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"> <head> <title></title> <style type="text/css"> * .box { display: static; overflow: visible; visibility: visible; width: 160px; height: 150px; padding: 30px; border-top: 30px solid gray; border-bottom: 30px solid black; border-left: 30px solid gray; border-right: 30px solid black; margin-left: 230px; margin-top: 80px; background-color: #ccc; } </style> </head> <body> <h1>Box Model</h1> <div class="box"></div> </body> </html>