If you know the height of your centered box, it's not that hard. Create a wrapper div whose top is set 50% down the page but has a negative offset which is 50%

If you know the height of your centered box, it's not that hard. Create a wrapper div whose top is set 50% down the page but has a negative offset which is 50% the height of the box: .vertically-centered { position: absolute top: 50%; height: 200px; margin-top: -100px; /* minus half of `height` */ } If you have trouble, try setting `height` to 100% on the <body> tag and any parents