* {
  box-sizing: content-box;
}

html, body {
  width: 100%;
  height: 100%;
}

body {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr);
}

#canvas {
  width: 100%;
  height: 100%;
  background: black;
}