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HTML

              
                <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    
    <!-- Imporant meta information to make the page as rigid as possible on mobiles, to avoid unintentional zooming on the page itself  -->
    <meta name="viewport" content="width=device-width, height=device-height, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">

    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Character Tutorial</title>
    
</head>
<body>
  
  <!-- The loading element overlays all else until the model is loaded, at which point we remove this element from the DOM -->  
<!-- <div class="loading" id="js-loader"><div class="loader"></div></div> -->
  
<div class="wrapper">
    <!-- The canvas element is used to draw the 3D scene -->
<canvas id="c"></canvas>

</div>
</body>
</html>

<!-- The main Three.js file -->
<script src='https://cdnjs.cloudflare.com/ajax/libs/three.js/108/three.min.js'></script>

<!-- This brings in the ability to load custom 3D objects in the .gltf file format. Blender allows the ability to export to this format out the box -->
<script src='https://cdn.jsdelivr.net/gh/mrdoob/Three.js@r92/examples/js/loaders/GLTFLoader.js'></script>

              
            
!

CSS

              
                body,
html {
  margin: 0;
  padding: 0;
  background: #25252B;
}
* {
  touch-action: manipulation;
}
*,
*:before,
*:after {
  box-sizing: border-box;
}
body {
  position: relative;
  width: 100%;
  height: 100vh;
}
.wrapper {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
#c {
  position: absolute;
  top: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.loading {
  position: fixed;
  z-index: 50;
  width: 100%;
  height: 100%;
  top: 0; left: 0;
  background: #f1f1f1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.loader{
  -webkit-perspective: 120px;
  -moz-perspective: 120px;
  -ms-perspective: 120px;
  perspective: 120px;
  width: 100px;
  height: 100px;
}

.loader:before{
  content: "";
  position: absolute;
  left: 25px;
  top: 25px;
  width: 50px;
  height: 50px;
  background-color: #9bffaf;
  animation: flip 1s infinite;
}

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

  50% {
    transform: rotateY(180deg);
  }

  100% {
    transform: rotateY(180deg)  rotateX(180deg);
  }
}
              
            
!

JS

              
                
              
            
!
999px

Console