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<!DOCTYPE html> <html> <head> <style type="text/css"> #float-blue { float: left; margin-right: 20px; background-color: blue; height: 100px; } .float-green { float: left; margin: 0 20px; background-color: green; width: 40px; height: 100px; } </style> </head> <body> <div id="float-blue"><div class="float-green"></div></div><div class="float-green"></div> </body> </html>