body {
    margin:0;
    padding:0;
    overflow:hidden;
    width:100%;
    height:100%;
    font-family:Arial, sans-serif;
    background:rgba(59,51,64);
}
canvas {
    margin:0;
    padding:0;
    position:absolute;
    top:0;
    left:0;
    width:100%;
    height:100%;
}