html, body {
  padding: 0;
  margin: 0;
  height: 100%;
  overflow: hidden;
  font-family: sans-serif;
}

svg {
  width: 100%;
  height: 100%;
  background: #333;
}

rect {
  fill: #333;
  stroke: #fff;
  stroke-width: 1;  
  vector-effect: non-scaling-stroke;
}