/* The page is a screen: black around the cells, nothing else on it. */
html, body { margin: 0; height: 100%; background: #000; overflow: hidden; }
canvas { display: block; }
/* The DOS picture fills its window (dos.js, picture 'fill'), at any scale;
   js-dos then smooths it, and lesson graphics are pixels - keep them blocks. */
[data-owl-own-keys] canvas { image-rendering: pixelated !important; }