<html xmlns="http://www.w3.org/1999/xhtml"> <style id="s"> .container { height: 20px; } .overflow { height: 30px; } body { width: 300px; -moz-column-width: 100px; } </style> <body> <div class="container"> <div class="overflow"></div> </div> <div class="container"> <div class="overflow"></div> </div> </body> </html>