body,
html {
  margin: 0;
  padding: 0;
  display: flex;
  background: white;
}

canvas {
  display: block;
}

.container {
  height: 100vh;
  width: 100vw;
}

.container.loading {
  display: flex;
  justify-content: center;
  align-items: center;
}

.container.loading::before {
  content: '';
  box-sizing: border-box;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: 5px solid cyan;
  border-top-color: magenta;
  border-right-color: yellow;
  border-bottom-color: black;
  animation: spinner .6s linear infinite;
}

@keyframes spinner {
  to {transform: rotate(360deg);}
}