header:before {
    content: ' ';
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    opacity: 0.7;
    background-attachment: scroll;
    background-image: url(https://d2inydppt1m29y.cloudfront.net/PropertyAssets/pn2609/images/PN2609_Prelude.vrs.w800-h533.jpg);
    background-position: center center;
    background-repeat: no-repeat;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    background-size: cover;
    -o-background-size: cover;
}

header {
    position: relative;
    background: #000;
    overflow: hidden;
}

header .container {
    position: relative;
    color: #fff;
    z-index: 2;
    text-align: center;
}