<!DOCTYPE html> <html> <head> <style type="text/css"> #float-blue { float: left; margin-right: 40px; background-color: blue; width: 40px; height: 100px; } .float-green { float: left; margin-right: 40px; background-color: green; width: 40px; height: 100px; } </style> </head> <body> <div id="float-blue"></div> <div class="float-green"></div> <div class="float-green"></div> </body> </html>