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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

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CSS

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CSS Base

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Babel includes JSX processing.

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HTML 

              
                <html>
  <head>
    <script src="index.js"></script>
    <script>
      var main_object;
      document.addEventListener('DOMContentLoaded', function () {

	// Initilalize Renderer -------------------------------------------------------------------------
	const renderer = new THREE.WebGLRenderer({
		canvas: document.querySelector('#myCanvas'),
		antialias: false
	});
	renderer.setClearColor(0xFFFFFF, 1);
	
  renderer.setSize(window.innerWidth, window.innerHeight);
	renderer.setPixelRatio(window.devicePixelRatio);

	// Initialize Scene
	const scene = new THREE.Scene();

	// Careate geometry
	let img = document.querySelector("#item");
	let canvas = createCanvas(img.width, img.height);
	canvas.context.drawImage(img, 0, 0);
	let geometry = new THREE.PixelArtGeometry(canvas.canvas, 1);
	canvas.canvas.remove();
	
	// create texture
	let texture = new THREE.TextureLoader().load(img.src);
	texture.magFilter = THREE.NearestFilter;
	texture.minFilter = THREE.NearestFilter;
	texture.type = THREE.FloatType;
	
	// Creating Emissive Map for animation
	let emissiveMaps = [];
	for(let i=0; i<56; i++){
		let canvas = drawAnimated(i);
		let texture = new THREE.CanvasTexture(canvas);
		texture.magFilter = THREE.NearestFilter;
		texture.minFilter = THREE.NearestFilter;
		texture.type = THREE.FloatType;
		emissiveMaps.push(texture);
	}

	// Create material
	let material = new THREE.MeshLambertMaterial({
		map: texture,
		emissiveMap: emissiveMaps[0],
		emissive: "#ef22ef", /// Emissive Color
		transparent: false,
		side: THREE.DoubleSide,
		alphaTest: 0.99 
	})

	// Create mesh
	let box = new THREE.Mesh(
		geometry, 
		material
	);
	box.scale.set(10, 10, 10);
	main_object = box;

	// add object to scene
	scene.add(main_object);

	// rander
	Render(scene);

	function Render(scene) {

		// Initialize camera
		var viewSize = 300;

		var aspectRatio = window.innerWidth / window.innerHeight;
		const camera = new THREE.OrthographicCamera(
			-aspectRatio * viewSize / 2,
			aspectRatio * viewSize / 2,
			viewSize / 2,
			-viewSize / 2,
			-1000,
			1000
		);

		camera.position.set(viewSize, viewSize * 0.8168, viewSize); // Isometric position
		camera.lookAt(scene.position);

		// Initialize lighting -------------------------------------------------------------------------------------

		let dirLight = new THREE.DirectionalLight(0xFFFFFF);
		dirLight.intensity = 0.435;
		dirLight.position.set(-1, 2.25, 1.24).normalize();
		dirLight.castShadow = true;
		dirLight.shadow.mapSize.width = 2048;
		dirLight.shadow.mapSize.height = 2048;
		let d = 50;
		dirLight.shadow.camera.left = -d;
		dirLight.shadow.camera.right = d;
		dirLight.shadow.camera.top = d;
		dirLight.shadow.camera.bottom = -d;
		dirLight.shadow.camera.far = 3500;
		dirLight.shadow.bias = -0.0001;
		scene.add(dirLight);

		let ambientLight = new THREE.AmbientLight(0xFCFCFF);
		ambientLight.intensity = 0.618;
		scene.add(ambientLight);

		// Begin render -------------------------------------------------------------------------------------

		let pos_cycle = 0;
		let glint_cycle = 0;

		tick();

		//// Tick ////
		function tick() {

			// object positions
			pos_cycle = pos_cycle < 360 ? pos_cycle + 1 : 0;
			var y = Math.sin(deg2rad(pos_cycle * 2)) * 20;
			main_object.position.set(0, -y, 0);
			main_object.rotation.set(0, deg2rad(pos_cycle * 1), 0);
			
			// Switch emissive maps
			main_object.material.emissiveMap = emissiveMaps[Math.floor(glint_cycle)];
			glint_cycle = glint_cycle < emissiveMaps.length ? glint_cycle + 0.1 : 0;

			// re-render
			renderer.render(scene, camera);
			requestAnimationFrame(tick); //loop
		}
	}

})

function drawAnimated(cycle) {
	let cycle2 = (cycle + 32) % 56;

	let width = 64;
	let height = 64;

	/// Create Base Canvas
	let canvas = createCanvas(width, height);
	canvas.context.clearRect(0, 0, width, height);
	canvas.context.fillStyle = "#000000";
	canvas.context.fillRect(0, 0, width, height);

	/// Load Glint Map
	let enchant_glint = createCanvas(width, height);
	enchant_glint.context.drawImage(document.querySelector("#enchant_glint"), 0, 0);

	/// rotated canvas width
	let canvas_width = Math.sqrt(2) * (([height, width]).sort((a, b) => { return a - b })[1]);

	/// Draw emissive map rotated 80°
	{
		let stretchCanvas = createCanvas(canvas_width, canvas_width);
		stretchCanvas.context.imageSmoothingEnabled = true;
		stretchCanvas.context.drawImage(enchant_glint.canvas, cycle, 0, 8, 64, 0, 0, canvas_width, canvas_width);

		let rotatedCanvas = createCanvas(width, height);
		rotatedDraw(rotatedCanvas.context, stretchCanvas.canvas, 0, 0, canvas_width, canvas_width, 0, 0, width, width, 80);
		margeDraw(canvas.canvas, rotatedCanvas.canvas);

		stretchCanvas.canvas.remove();
		rotatedCanvas.canvas.remove();
	}

	/// Draw emissive map rotated -10°
	{
		let stretchCanvas = createCanvas(canvas_width, canvas_width);
		stretchCanvas.context.imageSmoothingEnabled = true;
		stretchCanvas.context.drawImage(enchant_glint.canvas, 56 - cycle2, 0, 8, 64, 0, 0, canvas_width, canvas_width);

		let rotatedCanvas = createCanvas(width, height);
		rotatedDraw(rotatedCanvas.context, stretchCanvas.canvas, 0, 0, canvas_width, canvas_width, 0, 0, width, width, -10);
		margeDraw(canvas.canvas, rotatedCanvas.canvas);

		stretchCanvas.canvas.remove();
		rotatedCanvas.canvas.remove();
	}

	return canvas.canvas;
}

function createCanvas(width, height) {
	let canvas = document.createElement("canvas");
	canvas.setAttribute("width", width);
	canvas.setAttribute("height", height);
	let context = canvas.getContext('2d');
	context.imageSmoothingEnabled = false;
	return { canvas: canvas, context: context }
}

function margeDraw(dest_canvas, src_canvas) {
	let ctx = src_canvas.getContext('2d');
	let ctx2 = dest_canvas.getContext('2d');
	let w = src_canvas.width;
	let h = src_canvas.height;
	let data = ctx.getImageData(0, 0, w, h);
	let data2 = ctx2.getImageData(0, 0, w, h);
	let clamp = (value) => {
		return value < 0 ? 0 : value > 255 ? 255 : value;
	};
	for (let x = 0; x < w; x++) {
		for (let y = 0; y < h; y++) {
			let d = (x + y * data.width) * 4;
			let r = data.data[d], g = data.data[d + 1], b = data.data[d + 2];
			let r2 = data2.data[d], g2 = data2.data[d + 1], b2 = data2.data[d + 2], a2 = data.data[d + 3];
			
			let opacity = 0.5;
			a2 = Math.floor(a2 * opacity);
			data2.data[d + 0] = Math.floor(clamp(r * a2 / 255 + (255 - a2) * r2 / 255));
			data2.data[d + 1] = Math.floor(clamp(r * a2 / 255 + (255 - a2) * g2 / 255));
			data2.data[d + 2] = Math.floor(clamp(b * a2 / 255 + (255 - a2) * b2 / 255));
			data2.data[d + 3] = 255;
		}
	}
	ctx2.putImageData(data2, 0, 0);
}

function rotatedDraw(context, image, srcX, srcY, srcW, srcH, dstX, dstY, dstW, dstH, angle) {
	// create temporary large canvas
	let canvas = document.createElement("canvas");
	canvas.setAttribute("width", srcW * 2);
	canvas.setAttribute("height", srcH * 2);
	let contex = canvas.getContext('2d');

	// rotated draw
	contex.beginPath();
	contex.clearRect(0, 0, srcW, srcH);
	let x = srcW / 2;
	let y = srcH / 2;
	let angleInRadians = deg2rad(angle);
	contex.translate(x, y);
	contex.rotate(angleInRadians);
	contex.drawImage(image, srcX, srcY, srcW, srcH, -x, -y, srcW, srcH);
	contex.rotate(-angleInRadians);
	contex.translate(-x, -y);

	// bitblit to destination canvas
	context.drawImage(canvas, x - dstW / 2, y - dstH / 2, dstW, dstH, dstX, dstY, dstW, dstH);
	canvas.remove();
	return context;
}

function deg2rad(deg) {
	return deg * (Math.PI / 180)
}


    </script>
  </head>
  <body>
  <canvas id="myCanvas"></canvas>
      <img id="item" style="display:none" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAi0lEQVQ4y2NgIAO4uLj8h2GyNMOAhITEf7I079u3j3QDqKb5xo0bNNKMLVRBfJAmomwGKc7OzoYbQpJmZEOmTZsGVgzSBGKT5GeYASAMcg3JAYbuFZI1e5qJ/s/wkwNrhAUq0YaANHemq//XkOMGawBphBlEMPRBGGQzTDMygBlE0M8k+xfdBnINAAA+k7meeyM0+AAAAABJRU5ErkJggg==" alt="" />
  <img id="enchant_glint" style="display:none" src="data:image/png;base64,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" alt="" />
  </body>
</html>
!

CSS
!

JS 

              
                
THREE.PixelArtGeometry = function (canvas, depth, useVertexColors) {
	THREE.Geometry.call( this );
	this.faceVertexUvs[0] = [];
	let ctx = canvas.getContext('2d'),
		w = canvas.width, 
		h = canvas.height,
		z = depth,
		v = [],
		color = new THREE.Color("#FFFFFF");
	let data = ctx.getImageData(0, 0, w, h);

	if(!useVertexColors){
		// front face
		v = [
			this.vertices.push(new THREE.Vector3(0,  0,  z)) -1,
			this.vertices.push(new THREE.Vector3(w,  0,  z)) -1,
			this.vertices.push(new THREE.Vector3(0, -h,  z)) -1,
			this.vertices.push(new THREE.Vector3(w, -h,  z)) -1,
		];
		this.faces.push(
			new THREE.Face3(v[2], v[1], v[0], THREE.vertexNormals, color, 0),
			new THREE.Face3(v[1], v[2], v[3], THREE.vertexNormals, color, 0)
		);
		this.faceVertexUvs[0].push(
			[ new THREE.Vector2(0, 0), new THREE.Vector2(1, 1), new THREE.Vector2(0, 1) ],
			[ new THREE.Vector2(1, 1), new THREE.Vector2(0, 0), new THREE.Vector2(1, 0) ]
		);

		// back face
		v = [
			this.vertices.push(new THREE.Vector3(0,  0,  0)) -1,
			this.vertices.push(new THREE.Vector3(w,  0,  0)) -1,
			this.vertices.push(new THREE.Vector3(0, -h,  0)) -1,
			this.vertices.push(new THREE.Vector3(w, -h,  0)) -1,
		];
		this.faces.push(
			new THREE.Face3(v[0], v[1], v[2], THREE.vertexNormals, color, 0),
			new THREE.Face3(v[3], v[2], v[1], THREE.vertexNormals, color, 0)
		);
		this.faceVertexUvs[0].push(
			[ new THREE.Vector2(0, 1), new THREE.Vector2(1, 1), new THREE.Vector2(0, 0) ],
			[ new THREE.Vector2(1, 0), new THREE.Vector2(0, 0), new THREE.Vector2(1, 1) ]
		);
	}

	for(let x=0;x<w;x++)
	{
		for(let y=0;y<h;y++)
		{
			//////// vertices / face ////////
			let d = (x + y * data.width) * 4;
			if(data.data[d+3]) {
				if(useVertexColors){
					color = new THREE.Color(data.data[d]<<16 ^ data.data[d+1]<<8 ^ data.data[d+2]);
				}
				color.offsetHSL(0, 0, 1-data.data[d+3]/255);
				let chk = {
					right:  x+1>=w || !data.data[(x+1 + (y  ) * data.width) * 4 + 3],
					left:   x-1<0  || !data.data[(x-1 + (y  ) * data.width) * 4 + 3],
					top:    y+1>=h || !data.data[(x   + (y+1) * data.width) * 4 + 3],
					bottom: y-1<0  || !data.data[(x   + (y-1) * data.width) * 4 + 3],
				};

				if(useVertexColors){
					// front face
					v = [ // vertex indices. (array.push() returns array.length)
						this.vertices.push(new THREE.Vector3(x,   -y,     z)) -1,
						this.vertices.push(new THREE.Vector3(x+1, -y,     z)) -1,
						this.vertices.push(new THREE.Vector3(x,   -(y+1), z)) -1,
						this.vertices.push(new THREE.Vector3(x+1, -(y+1), z)) -1,
					];
					this.faces.push(
						new THREE.Face3(v[2], v[1], v[0], THREE.vertexNormals, color, 0),
						new THREE.Face3(v[1], v[2], v[3], THREE.vertexNormals, color, 0)
					);
					this.faceVertexUvs[0].push(
						[ new THREE.Vector2(x/w, 1-y/h), new THREE.Vector2((x+1)/w, 1-(y+1)/h), new THREE.Vector2(x/w,     1-(y+1)/h) ],
						[ new THREE.Vector2(x/w, 1-y/h), new THREE.Vector2((x+1)/w, 1-y/h    ), new THREE.Vector2((x+1)/w, 1-(y+1)/h) ]
					);

					// back face
					v = [
						this.vertices.push(new THREE.Vector3(x,   -y,     0)) -1,
						this.vertices.push(new THREE.Vector3(x+1, -y,     0)) -1,
						this.vertices.push(new THREE.Vector3(x,   -(y+1), 0)) -1,
						this.vertices.push(new THREE.Vector3(x+1, -(y+1), 0)) -1,
					];
					this.faces.push(
						new THREE.Face3(v[0], v[1], v[2], THREE.vertexNormals, color, 0),
						new THREE.Face3(v[3], v[2], v[1], THREE.vertexNormals, color, 0)
					);
					this.faceVertexUvs[0].push(
						[ new THREE.Vector2((x+1)/w, 1-y/h), new THREE.Vector2(x/w, 1-(y+1)/h), new THREE.Vector2((x+1)/w, 1-(y+1)/h) ],
						[ new THREE.Vector2((x+1)/w, 1-y/h), new THREE.Vector2(x/w, 1-y/h    ), new THREE.Vector2(x/w,     1-(y+1)/h) ]
					);
				}

				if(chk.right){
					v = [
						this.vertices.push(new THREE.Vector3(x+1, -y,     z)) -1,
						this.vertices.push(new THREE.Vector3(x+1, -y,     0)) -1,
						this.vertices.push(new THREE.Vector3(x+1, -(y+1), z)) -1,
						this.vertices.push(new THREE.Vector3(x+1, -(y+1), 0)) -1,
					];
					this.faces.push(
						new THREE.Face3(v[2], v[1], v[0], THREE.vertexNormals, color, 0),
						new THREE.Face3(v[1], v[2], v[3], THREE.vertexNormals, color, 0)
					);
					this.faceVertexUvs[0].push(
						[ new THREE.Vector2(x/w, 1-y/h), new THREE.Vector2((x+1)/w, 1-(y+1)/h), new THREE.Vector2(x/w,     1-(y+1)/h) ],
						[ new THREE.Vector2(x/w, 1-y/h), new THREE.Vector2((x+1)/w, 1-y/h    ), new THREE.Vector2((x+1)/w, 1-(y+1)/h) ]
					);
				}

				if(chk.left){
					v = [
						this.vertices.push(new THREE.Vector3(x, -y,     z)) -1,
						this.vertices.push(new THREE.Vector3(x, -y,     0)) -1,
						this.vertices.push(new THREE.Vector3(x, -(y+1), z)) -1,
						this.vertices.push(new THREE.Vector3(x, -(y+1), 0)) -1,
					];
					this.faces.push(
						new THREE.Face3(v[0], v[1], v[2], THREE.vertexNormals, color, 0),
						new THREE.Face3(v[3], v[2], v[1], THREE.vertexNormals, color, 0)
					);
					this.faceVertexUvs[0].push(
						[ new THREE.Vector2((x+1)/w, 1-y/h), new THREE.Vector2(x/w, 1-(y+1)/h), new THREE.Vector2((x+1)/w, 1-(y+1)/h) ],
						[ new THREE.Vector2((x+1)/w, 1-y/h), new THREE.Vector2(x/w, 1-y/h    ), new THREE.Vector2(x/w,     1-(y+1)/h) ]
					);
				}
				
				if(chk.top){
					v = [
						this.vertices.push(new THREE.Vector3(x,   -(y+1), z)) -1,
						this.vertices.push(new THREE.Vector3(x+1, -(y+1), z)) -1,
						this.vertices.push(new THREE.Vector3(x,   -(y+1), 0)) -1,
						this.vertices.push(new THREE.Vector3(x+1, -(y+1), 0)) -1,
					];
					this.faces.push(
						new THREE.Face3(v[2], v[1], v[0], THREE.vertexNormals, color, 0),
						new THREE.Face3(v[1], v[2], v[3], THREE.vertexNormals, color, 0)
					);
					this.faceVertexUvs[0].push(
						[ new THREE.Vector2(x/w, 1-y/h), new THREE.Vector2((x+1)/w, 1-(y+1)/h), new THREE.Vector2(x/w,     1-(y+1)/h) ],
						[ new THREE.Vector2(x/w, 1-y/h), new THREE.Vector2((x+1)/w, 1-y/h    ), new THREE.Vector2((x+1)/w, 1-(y+1)/h) ]
					);
				}

				if(chk.bottom){
					v = [
						this.vertices.push(new THREE.Vector3(x,   -y, z)) -1,
						this.vertices.push(new THREE.Vector3(x+1, -y, z)) -1,
						this.vertices.push(new THREE.Vector3(x,   -y, 0)) -1,
						this.vertices.push(new THREE.Vector3(x+1, -y, 0)) -1,
					];
					this.faces.push(
						new THREE.Face3(v[0], v[1], v[2], THREE.vertexNormals, color, 0),
						new THREE.Face3(v[3], v[2], v[1], THREE.vertexNormals, color, 0)
					);
					this.faceVertexUvs[0].push(
						[ new THREE.Vector2((x+1)/w, 1-y/h), new THREE.Vector2(x/w, 1-(y+1)/h), new THREE.Vector2((x+1)/w, 1-(y+1)/h) ],
						[ new THREE.Vector2((x+1)/w, 1-y/h), new THREE.Vector2(x/w, 1-y/h    ), new THREE.Vector2(x/w,     1-(y+1)/h) ]
					);
				}
			}
		}
	}
	this.center();
	this.mergeVertices();
	this.computeFaceNormals();
};

THREE.PixelArtGeometry.prototype = Object.create(THREE.Geometry.prototype);
THREE.PixelArtGeometry.prototype.constructor = THREE.PixelArtGeometry;
!
999px

Console