#container { position: relative; width: 200px; height: 200px; border: solid 1px black; } #box1 { float: left; width: 50%; height: 150px; background: red; } #box2 { float: left; width: 40%; height: 100px; background: blue; } #box3 { float: left; width: 30%; height: 70px; background: yellow; }
<div id="container"> <div id="box1"></div> <div id="box2"></div> <div id="box3"></div> </div>