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

body {
  background: black;
  overflow: hidden;
}

canvas {
  position: fixed;
  top: 50vh;
  left: 50vw;
  transform: translate(-50%, -50%);
  height: 100vh;
  width: auto;
  background: pink;
}