html {
    background-color: transparent;
}

body {
    height: 100%;
    min-height: 100%;
    display: block;
    background: url(../Images/bg.png) no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}