*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #1a1a2e;
  font-family: 'Courier New', Courier, monospace;
}

#app {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

#game-canvas {
  display: block;
  /* Crisp pixel rendering */
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  /* Size is set programmatically by Renderer.resize() */
}

#ui-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none; /* passes clicks through to canvas by default */
}

/* UI sub-elements that need interaction re-enable pointer events */
#ui-layer .interactive {
  pointer-events: auto;
}