body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

canvas {
  width: 100%;
  height: 100%;
}

var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(
  30,
  window.innerWidth / window.innerHeight,
  0.1,
  1000
);

var renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

// add cube
var geometry = new THREE.BoxGeometry(20, 20, 20);
// use hex string
var color = new THREE.Color("#6f4171");
// use rgba string
var color = new THREE.Color("rgba(188, 141, 190, 1)");
var color = new THREE.Color("#7833aa");
var hex = color.getHex();
var material = new THREE.MeshLambertMaterial({ color: hex });

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

// rotate cube
cube.rotation.x = 0.45;
cube.rotation.y = -0.25;

camera.position.z = 100;

var light = new THREE.PointLight(0xffff00);
light.position.set(10, 0, 25);
scene.add(light);

var render = function () {
  requestAnimationFrame(render);

  renderer.render(scene, camera);
};

render();