html, body {
  background-color: #000
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}
canvas {
  display: block;
}

#loading-screen {
  position: absolute;
  z-index: 2;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #000;
  opacity: 1;
  transition: 1s opacity;
}

#loading-screen.fade-out {
  opacity: 0;
}

#loader {
  display: block;
  position: relative;
  left: 50%;
  top: 50%;
  width: 50px;
  height: 50px;
  margin: -25px 0 0 -25px;
  border-radius: 50%;
  border: 1px solid transparent;
  border-top-color: #FFF;
  -webkit-animation: spin 2s linear infinite;
  animation: spin 2s linear infinite;
}
#loader:before {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  right: 2px;
  bottom: 2px;
  border-radius: 50%;
  border: 1px solid transparent;
  border-top-color: #FFF;
  -webkit-animation: spin 3s linear infinite;
  animation: spin 3s linear infinite;
}
#loader:after {
  content: "";
  position: absolute;
  top: 6px;
  left: 6px;
  right: 6px;
  bottom: 6px;
  border-radius: 50%;
  border: 1px solid transparent;
  border-top-color: #FFF;
  -webkit-animation: spin 1.5s linear infinite;
  animation: spin 1.5s linear infinite;
}
@-webkit-keyframes spin {
  0%   {
    -webkit-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@keyframes spin {
  0%   {
    -webkit-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}