JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdn.jsdelivr.net/npm/[email protected]/build/three.js"></script>

CSS

body {
	  margin: 0;
}

JavaScript

let camera, scene, renderer;

init();
animate();

function init() {

    camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.01, 10 );
    camera.position.z = 2;

    scene = new THREE.Scene();

    const geometry = new THREE.PlaneGeometry();
    const material = new THREE.MeshBasicMaterial( { transparent: true } );

		setTimeout( () => {
		
			material.opacity = 0.5;
		
		}, 1000 );

    const 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 );

}

function animate() {

    requestAnimationFrame( animate );
    renderer.render( scene, camera );

}