html,
body {
  margin: 0;
  padding: 0;
  overflow: hidden;
}

canvas {
  display: block;
}

.nav-link {
  position: fixed;
  top: 12px;
  right: 15px;
  font-family: sans-serif;
  font-size: 13px;
  color: #888;
  text-decoration: none;
  z-index: 10;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.nav-link:hover {
  opacity: 1;
  text-decoration: underline;
}