html, body {
  margin: 0px;
  padding: 0px;
}

body {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #303030;
  padding: 3vmin;
}

canvas {
  object-fit:scale-down;
  max-width: 100vh;
  max-height: 100vh;
  /* box-shadow: 0px 0px 50px rgba(0,0,0,0.7); */
}