JSFiddle - React, Tailwind, and code Playground

JavaScript

var SCREEN_WIDTH = window.innerWidth - 100;
var SCREEN_HEIGHT = window.innerHeight - 100;

var camera, scene;
var canvasRenderer, webglRenderer;

var container, mesh, geometry, plane;

var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;

init();
animate();

function init() {

    container = document.createElement('div');
    document.body.appendChild(container);

    camera = new THREE.PerspectiveCamera(30, window.innerWidth / window.innerHeight, 1, 100000);
    camera.position.x = 1200;
    camera.position.y = 1000;
    camera.lookAt({
        x: 0,
        y: 0,
        z: 0
    });

    scene = new THREE.Scene();
    
    var groundMaterial = new THREE.MeshPhongMaterial({
        color: 0x6C6C6C
    });
    plane = new THREE.Mesh(new THREE.PlaneGeometry(500, 500), groundMaterial);
    plane.rotation.x = -Math.PI / 2;
    plane.receiveShadow = true;

    scene.add(plane);

    // LIGHTS
    scene.add(new THREE.AmbientLight(0x666666));

    var light;

    light = new THREE.DirectionalLight(0xdfebff, 1.75);
    light.position.set(300, 400, 50);
    light.position.multiplyScalar(1.3);

    light.castShadow = true;
    light.shadowCameraVisible = true;

    light.shadowMapWidth = 512;
    light.shadowMapHeight = 512;

    var d = 200;

    light.shadowCameraLeft = -d;
    light.shadowCameraRight = d;
    light.shadowCameraTop = d;
    light.shadowCameraBottom = -d;

    light.shadowCameraFar = 1000;
    light.shadowDarkness = 0.2;

    scene.add(light);
    
    var boxgeometry = new THREE.CubeGeometry(100, 100, 100);
    var boxmaterial = new THREE.MeshLambertMaterial({
        color: 0x0aeedf
    });
    var cube = new THREE.Mesh(boxgeometry, boxmaterial);
    cube.castShadow = true;
    cube.position.x = 0;
    cube.position.y = 100;
    cube.position.z = 0;

    scene.add(cube);

    // RENDERER
    webglRenderer = new THREE.WebGLRenderer();
    webglRenderer.setSize(SCREEN_WIDTH, SCREEN_HEIGHT);
   ...