body{background:gray;}
#wrapper{width:1000px;height:1000px;background:cyan;}

#header{width:100%;height:15%;background:pink;}

#header h1{font-size:80px; margin:10px auto;padding:30px;}

#footer{width:100%;height:20%;background:red;}
#one{width:330px;height:100px;background:yellow;float:left;}
#two{width:330px;height:100px;background:orange;float:left;}
#three{width:340px;height:100px;background:pink;float:left;}