:-moz-full-screen canvas {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    margin: auto;
    width: 640px;
    height: 480px%;
    box-shadow: 0px 0px 4px black;
    background-color: black;
}
:-webkit-full-screen canvas {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    margin: auto;
    width: 640px;
    height: 480px;
    box-shadow: 0px 0px 4px black;
    background-color: black;
}

#canvas {
background:url('https://vfat.classicreload.com/v7/img/pdgol.png') }
border: 4px black solid;
background-size: 100% 100%;
image-rendering:-moz-crisp-edges;image-rendering:-o-crisp-edges;image-rendering:-webkit-optimize-contrast;image-rendering:crisp-edges;-ms-interpolation-mode:nearest-neighbor;
}