body {
    /* Allow canvas to hit the edges of the browser viewport. */
    margin: 0;
}

#screen canvas {
    margin: auto;

    /* Hide the gap for font descenders. */
    display: block;

	/* disable scaling interpolation */
	image-rendering: optimizeSpeed;
	image-rendering: -moz-crisp-edges;
	image-rendering: -o-crisp-edges;
	image-rendering: -webkit-optimize-contrast;
	image-rendering: optimize-contrast;
	-ms-interpolation-mode: nearest-neighbor;
}