Yootheme layout

Source : http://www.yootheme.com/warp/module-system

Example: Publish two modules in the “top” position on your “Home” menu item. The width of each module will be 50% by default. To have the golden ratio proportions go to the menu manager and set the page class suffix to “top-goldenratio” in the parameters of the “Home” menu item. Now the width of the first module will be 65% and of the second module 35% on the page “Home”