#html, head, body {
  background-color: #000000;
  margin: 0;
  padding: 0;
  width: 100%;
  aspect-ratio: 1;
}

#container {
  position: fixed;
  display: block;
  height: 100%;
  width: 100%; 
}

#animationBox {
  display: block;
  position: absolute;
  transition: background-color 0.10s ease;
  -webkit-transition: background-color 0.10s ease;
  -moz-transition: background-color 0.10s ease;
  -o-transition: background-color 0.10s ease;
  height: 20vh;
  width: 20vw;
  top: 235px;
  left: 10px;
}