html {
    /* Weighted Companion Cube,
    made by feinschmecker
    http://feinschmecker.deviantart.com/art/Weighted-Companion-Cube-68180513 */
    background: url(../files/BlackPurple.jpg) no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}