Untitled

<html>
<style>
	#left
        {
		width: 100px;
		height: 100%;
		background: red;
		float: left;
        }
        #right
        {
		margin-left: 100px;
		background: green;
		height: 100%;
        }
</style>
<body>
        <div id="left"> </div>
        <div id="right"> </div>
</body>
</html>