* {
    margin: 0;
    padding: 0;
  }
  
  html,
  body {
    overflow: hidden;
  }
  
  .webgl {
    position: fixed;
    top: 0;
    left: 0;
    outline: none;
  }
  canvas {
    cursor: grab;
  }
  canvas.-dragging {
    cursor: grabbing;
  }
  canvas.-moving {
    cursor: move;
  }
  canvas.-zoomIn {
    cursor: zoom-in;
  }
  /* Amin */
  html,
  body {
    width: 100%;
    height: 100%;
    padding: 0;
    margin: 0;
    overflow: hidden;
  }
  canvas {
    position: fixed;
    width: 100%;
    height: 100%;
  }
  
  .button {
    position: fixed;
    z-index: 1;
    top: 30px;
    left: 30px;
    display: inline-block;
    padding: 8px 10px;
    background: black;
    border-radius: 4px;
    color: white;
    font-family: Arial, Helvetica, sans-serif;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
  }
  .button:hover {
    background: white;
    color: black;
  }
  
  #loading-screen {
    position: absolute;
    z-index: 2;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: white;
    opacity: 1;
    transition: 1s opacity;
  }
  
  #loading-screen.fade-out {
    opacity: 0;
  }
  
  #loader {
    display: block;
    position: relative;
    left: 50%;
    top: 50%;
    width: 150px;
    height: 150px;
    margin: -75px 0 0 -75px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: #546e7a;
    -webkit-animation: spin 2s linear infinite;
    animation: spin 2s linear infinite;
  }
  #loader:before {
    content: "";
    position: absolute;
    top: 5px;
    left: 5px;
    right: 5px;
    bottom: 5px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: #ef6c00;
    -webkit-animation: spin 3s linear infinite;
    animation: spin 3s linear infinite;
  }
  #loader:after {
    content: "";
    position: absolute;
    top: 15px;
    left: 15px;
    right: 15px;
    bottom: 15px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: #546e7a;
    -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);
    }
  }