<html> <head> <style> ul { padding: 0px; margin: 0px; } li { margin: 0px; padding: 0px; float: left; width: 100px; height: 100px; display: block; } li.li1 { position: relative; left: 100px; background-color:green; } li.li2 { background-color:red; } </style> </head> <body> <p>You should see a single 100x100 green block below. If you see any red, the test has failed.</p> <ul> <li class="li1"></li> <li class="li2"></li> </ul> </html>