html { height: 100%; width: 100%; } body { margin: 0px; padding: 0px; height: 100%; width: 100%; overflow: hidden; } #menu { height: 10%; background: url(tile.jpg); font-family: arial helvetica san-serif; font-size: 20px; padding-top: 10px; text-align: center; font-weight: bold; color: #555; } #game { height: 90%; margin: 0px; padding: 0px; background: url(tile2.jpg); } canvas { margin: 0px; padding: 0px; } .left { float: left; } .right { float: right; }