DIV.Belt
{
    width:100%;
    position:relative;
    padding-top:2px;
    padding-bottom:2px;
    background-position:center center;
    background-size:100% auto;  
    background-repeat:no-repeat;  
}


@supports not (-webkit-touch-callout: none) {
    DIV.Belt[BackgroundFixed='true'] {
        background-position: center;
        background-attachment: fixed;
    }
}

DIV.Belt.BackgroundLandscape 
{
    background-size:auto 100%;  
}

DIV.Belt.BackgroundPortrait 
{
    background-size:100% auto;  
}
 

DIV.Belt > DIV
{
    width:100%;
    max-width:1200px;
    margin-left:auto;
    margin-right:auto;
}

.EditingArea DIV.Belt  {
    border: 1px dotted #b0b0b0;
}



.EditingArea DIV.Belt > DIV {
    border: 1px dotted green;
}