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

body {
  margin: 0px;
  height: 100%;
  width: 100%;
  background: black;
}

#surface {
  position: absolute;
  left: calc(100% / 2 - 250px);
  top: calc(100% / 2 - 250px);
  width: 500px;
  height: 500px;
}

p {
	position: absolute;
	left: 20px;
	bottom: 10px;
	color: #ddd;
	font-family: sans-serif;
}