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<!DOCTYPE html> <html> <head> <style type="text/css"> #float1, #float2 { width: 100px; height: 20px; background-color: green; margin-right: auto; } #spacer { height: 30px; } </style> </head> <body> <div id="container"> <div id="float1"></div> <div id="spacer"></div> <div id="float2"></div> </div> </body> </html>