JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdn.jsdelivr.net/npm/three@0.115/build/three.js"></script>
<script src="https://cdn.jsdelivr.net/npm/@tweenjs/tween.js@18.5.0/dist/tween.umd.js"></script>

CSS

body {
	  margin: 0;
}

JavaScript

var camera, scene, renderer;

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.PlaneGeometry( 0.2, 0.2 );
    var material = new THREE.MeshBasicMaterial();

    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 );
    
    var targetPosition = new THREE.Vector3( 0, 0.5, 0 );
    
    // create animation
    
    new TWEEN.Tween( mesh.position )
    	.to( targetPosition )
      .repeat( Infinity )
      .yoyo( true )
      .easing( TWEEN.Easing.Cubic.InOut )
      .start();

}

function animate() {

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

}