#main { position: relative;
 background-color: #B0B0B0; 
 width: 90%; 
 margin: 10px auto;
 border-style:solid;
 border-width:1px;
 min-height: 900px;}
        
#centre {
    padding: 5px;
    margin-left: 200px;
    margin-right: 200px;
}

#leftBar { 
width : 190px;
 float: left; margin: 0px;
 padding: 5px; 
 border-right: 1px solid gray;}

 #rightBar { 
width : 190px;
 float: right; margin: 0px;
 padding: 5px; 
 border-left: 1px solid gray;}

#footer {
padding: 1em;
}

#top {
border-bottom: 1px solid grey }