/* Center the loader */
 #loader {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 100;
  width: 120px;
  height: 120px;
  margin: -76px 0 0 -76px;

  border-radius: 50%;
  border: 16px solid #f3f3f3;
  -webkit-animation: spin 2s linear infinite;
  animation: spin 2s linear infinite;

  border-top: 16px solid blue;
  border-bottom: 16px solid blue;
}

@-webkit-keyframes spin {
  0% {
    -webkit-transform: rotate(0deg);
  }

  100% {
    -webkit-transform: rotate(360deg);
  }
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

/* Add animation to "page content" */
.animate-bottom {
  position: relative;
  -webkit-animation-name: animatebottom;
  -webkit-animation-duration: 1s;
  animation-name: animatebottom;
  animation-duration: 1s;
}

@-webkit-keyframes animatebottom {
  from {
    bottom: -100px;
    opacity: 0;
  }

  to {
    bottom: 0px;
    opacity: 1;
  }
}

@keyframes animatebottom {
  from {
    bottom: -100px;
    opacity: 0;
  }

  to {
    bottom: 0;
    opacity: 1;
  }
}

html, body {
  padding: 0;
  margin: 0;
  align-items: center;
  background: #333;
  color: #fff;
  display: flex;
  font-family: sans-serif;
  height: 100vh;
  height: calc(var(--vh, 1vh) * 100);
  justify-content: center;
}

main {
  display: inline;
}
canvas {
  aspect-ratio: 1;
  max-width: 100vw;
  max-height: 100vh;
  display: block;
  margin: 0 auto;
  vertical-align: middle;
  touch-action: none;
  width: auto !important;
  height: auto !important;
}