Layer compositing

index.html

@@ -7,9 +7,9 @@
   <style>
     * {box-sizing: border-box}
     html, body {padding: 0; margin: 0}
-    body {background: black; height:100vh; overflow: hidden;
-          display:flex; align-items:center; justify-content:center;}
-    canvas {image-rendering: pixelated}
+    body {background: black; height:100vh; overflow: hidden}
+    canvas {image-rendering: pixelated; margin: auto;
+            position:absolute; left:0; right:0; top:0; bottom:0}
     @font-face { font-family: 'text'; src:url(font.ttf) }
   </style>
 </head>