body{font-family:Arial,sans-serif;padding:20px}.box{width:100px;height:100px;margin:10px;color:#fff;text-align:center;line-height:100px;float:left}.red{background-color:red}.green{background-color:green}.blue{background-color:#00f}.clear-box{background-color:#d3d3d3;padding:20px;clear:both}