.mask {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: #000;
    opacity: .4;
    filter:alpha(opacity=40);
    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(opacity=40);";
    z-index: 9998;
}
.load{
    width: 40px;
    height: 40px;
    position: absolute;
    top: 50%;
    left:50%;
    margin-top: -20px;
    margin-left: -20px;
}