body {
    background-position: center center;
    background-attachment: fixed;
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    border: 0;
    background-size: cover !important;
    -webkit-background-size: cover !important;
    -moz-background-size: cover !important;
}