html, body{ 
 margin:0; 
 padding:0; 
 text-align:center; 
} 
 
#pagewidth{ 
 width:750px; 
 text-align:left;  
 margin-left:auto; 
 margin-right:auto;  
} 
 
#header{
 position:relative; 
 height:250px; 
 background-color:#ACACAC; 
 width:100%;
} 
 
#maincol
{background-color: #C0F9F9;  
 float: right; 
 display:inline; 
 position: relative; 
 width:; 
 }