html, body {
    width: 100%;
    height: 100%;
    padding: 0;
    margin: 0;
    background-color: #111111;
}

body {
    background-image:  url('teslabg.jpg');
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center; 
    background-size: 100% auto;
    background-color: #111111;
}