html, body {
    margin: 0;
    height: 100%;
    background: #000;
    overflow: hidden;
}
/* the single render surface: the world, interfaces, plugin panels and the dev tab bar
   (ui/debug-tooling) all draw here - there is no DOM dev harness any more */
#viewport {
    position: absolute;
    inset: 0;
}
#viewport canvas {
    display: block;
    width: 100%;
    height: 100%;
    outline: none;
}