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<!DOCTYPE html> <html> <head> <style> div.container { width: 30em; border: 1em solid; } div.box { box-sizing: border-box; width: 50%; border: 1em solid red; float: left; } </style> </head> <body> <div class="container"> <div class="box">This div occupies the left half.</div> <div class="box">This div occupies the right half.</div> <div style="clear:both;"></div> </div> </body> </html>