html,
body
{
    margin:0;
    overflow:hidden;
    background:#000;
    font-family:Arial;
}

canvas
{
    display:block;
}

#overlay
{
    position:absolute;
    top:15px;
    left:15px;

    color:white;

    background:rgba(0,0,0,.4);

    padding:10px;

    border-radius:6px;

    z-index:100;
}