*{margin:0px; padding:0px;}
#wrapper{width:900px;height:500px;border:solid black 2px; margin:60px auto;padding:center;}
#first{width:300px;height:500px;background:red;float:left;}
#second{width:300px;height:500px;background:gray;float:right;}
#third{width:300px;height:500px;background:cyan;float:right;}