@media screen and (max-width: 1200px) 
{
    #GridPage {width: 642px;}
    #contactDiv {float: right;width: 671px;}
    #textContact{ margin-right:0;}
    #GridLeft   { display:none;}
    #GridRight {width: 260px;}
}

@media(max-width: 767px) {
    #GridPage {width: 100%;}
}