JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://threejs.org/build/three.js"></script>
<script src="https://threejs.org/examples/js/controls/FlyControls.js"></script>

CSS

body {
	  margin: 0;
}
canvas {
	display: block;
}

JavaScript

var camera, scene, renderer;
var controls, clock;

init();
animate();

function init() {

    camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.01, 10 );
    camera.position.z = 1;

    scene = new THREE.Scene();

    var geometry = new THREE.BoxGeometry( 0.2, 0.2, 0.2 );
    var material = new THREE.MeshNormalMaterial();

   	var mesh = new THREE.Mesh( geometry, material );
    scene.add( mesh );

    renderer = new THREE.WebGLRenderer( { antialias: true } );
    renderer.setSize( window.innerWidth, window.innerHeight );
    document.body.appendChild( renderer.domElement );
	
		controls = new THREE.FlyControls( camera, renderer.domElement );
		controls.rollSpeed = 1;
		controls.dragToLook = true;
		
		clock = new THREE.Clock();

}

function animate() {

    requestAnimationFrame( animate );
		
		var delta = clock.getDelta();
			
		controls.update( delta );
		
    renderer.render( scene, camera );

}