.overlay {
    background: #000 none repeat scroll 0 0;
    height: 100%;
    left: 0;
    opacity: 0.5;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 999;
}
#load {
    left: 300px;
    margin: 0 auto;
    position: absolute;
    top: -50%;
}