body {
    font-family: helvetica-w01-light, helvetica-w02-light, sans-serif;
    font-size: 18px;
    color: #000;
}
a {
    color: #fff;
}
.header {
    text-align: center;
    margin: 30px;
}
div.bg {
    text-align: center;
    padding-top: 100px;
    background-image: 
	linear-gradient(rgba(66, 77, 14, 0.7), rgba(66, 77, 14, 0.7)),  /* overlay */
	url('background.jpg');  /* background image */
    background-size: cover;      /* scale image */
    background-position: center; /* center image */
    color: white;                /* text stays visible */
    width: 100%;
    height: 600px;
}