html, body {
     margin: 0;
     text-align: center;
     background-color: #F6F6F6;
}
 #fullscreen {
     position: fixed;
     top: 0;
     right: 0;
     bottom: 0;
     left: 0;
     display: flex;
     justify-content: center;
     align-items: center;
}
 #fullscreen canvas {
     object-fit: contain;
     max-height: 100%;
     max-width: 100%;
}
 .intro-text {
     position: fixed;
     top: -50px;
     right: 0;
     bottom: 0;
     left: 0;
     display: flex;
     justify-content: center;
     align-items: center;
     opacity: 0;
     font-size: 20px;
     font-family: Georgia, serif;
     transition:opacity 0.1s;
}

.loader{
  position: fixed;
  top: 45px;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #F8F8F8E;
  transition: opacity 0.75s, visibility 0.75s;
}

.loader-hidden{
  opacity: 0;
  visibility: hidden;
}

.loader::after{
  content: "";
  width: 20px;
  height: 20px;
  border: 5px solid #EE9E9E;
  border-top-color: #ffbb00;
  border-radius: 50%;
  animation: loading 2s ease infinite;
}

@keyframes loading {
  from {
    transform: rotate(0turn);
  }
  to{
    transform: rotate(1turn);
  }
}