body {

 overflow:auto;
 color: #aaaaaa;
 
 leftmargin:0px;
 
 rightmargin:0px; 
 
 topmargin:0px;
 
 bottommargin:0px;
 margin: 0px;
}



#OverDiv {

 position: absolute;
 
top: 0px;

 left:0px;

 width:400;
z-index: 1;

}


#UnderDiv {
 
position: absolute;
 
top: 0px;

 left:0px;

 width:100%;
 height:100%;
 right:auto;
 
z-index: 0;


}