.dlg_Container
{
     position: fixed; 
    padding:5px; background-color: #bfdbff; 
    border: solid 10px gray; 
    -webkit-border-radius: 15px 5px 5px 5px;
    -moz-border-radius: 15px 5px 5px 5px;
    -khtml-border-radius: 5px 5px 5px 5px;
    border-radius: 15px 15px 15px 15px;
   
}

.dlg_btn_Close
{
    background-position: bottom;
    position:absolute;
    top: -24px;
    right: -24px;
    cursor: pointer;
    width: 42px;
    height: 42px;
    text-indent: -999em;
    
    background-image: url('Images/overlay-close.png');
    background-repeat: no-repeat;
}

.dlg_btn_Close:hover
{
     background-position: top;
}