#backgroundContainer {
    position: absolute;
    width: 100%;
    height: 101%;
    background-position: center;
    background-size: cover;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-attachment: fixed;
    background-repeat: no-repeat;
    z-index: 0;
    opacity: 0;
}

.fade {
    -webkit-transition: opacity 3s ease-in-out;
    -moz-transition: opacity 3s ease-in-out;
    -o-transition: opacity 3s ease-in-out;
    transition: opacity 3s ease-in-out;
}