.leaveBackOfficeOverlay {
     background-color: white;
     position: absolute;
     top: 0;
     right: 0;
     bottom: 0;
     left: 0;
     width: 100%;
     height: 100%;
     opacity: 1;
     /* also -moz-opacity, etc. */
     z-index: 888;
     display: block;
 }

 .ajaxImage {
     position: fixed;
     top: 40%;
     left: 50%;
     margin: -28px 0 0 -25px;
     display: block;
     z-index: 999;
 }
 #main{
    visibility:hidden;
}