.parallax {
    z-index: 3;
    color: #fff;
    -moz-background-size: cover;
    -webkit-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    background-attachment: fixed;
    position: relative;
}
.parallax:before {
    content: "";
    background-color: #1e1e1e;
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    width: 100%;
    height: 100%;
    opacity: 0.4;
    filter: alpha(opacity=40);
    z-index: -1;
}