body {margin:0px;}
.main {
    width: 100%;
    height: 100%;
    background: url(darkspeedway.jpg) top left;
    position: absolute;
    background-size: cover;
}
.footer {
    position: absolute;
    bottom: 50px;
    width: 100%;
    text-align: center;
    color: #fff;
    font-family: Arial,arial,sans-serif;
}