body {
    margin: 0 auto;
    padding: 0;
    background-color: #ffffff;
    overflow: hidden;
}

#canvas
{

    left:0;
    right:0;
    top:0;
    bottom:0;
    margin-right: auto;
    margin-left: auto;
    margin-top: auto;
    margin-bottom: auto;
    z-index:-1;
    background-color:#000;
    position: absolute; left: 0; right: 0; margin: 0 auto; top: 0;
    overflow: hidden;
}


.white {background-color: #ffffff;}
.black {background-color: #000000;}
.original {background-color: #000000;}