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HTML

              
                <div id="screen">
	<span>
		<img id="bkg0" src="map.gif" alt="">
		<img id="bkg1" src="map.gif" alt="">
	</span>
</div>
              
            
!

CSS

              
                	html {
			overflow: hidden;
			-ms-touch-action: none;
			-ms-content-zooming: none;
	}
	
	body {
			position: absolute;
			background: #fff;
			width: 100%;
			height: 100%;
			margin: 0;
			padding: 0;
	}
	
	#screen {
			position: absolute;
			background: #000;
			width: 512px;
			height: 320px;
			left: 50%;
			top: 50%;
			margin-left: -256px;
			margin-top: -160px;
			user-select: none;
			outline: #eee solid 40px;
			-webkit-transform: rotate(-3deg);
			transform: rotate(-3deg);
	}
	
	#screen span {
			position: absolute;
			left: 0;
			top: 0;
			width: 100%;
			height: 100%;
			overflow: hidden;
	}
	
	#screen a,
	img {
			position: absolute;
			border: none;
			text-decoration: none;
			left: -9999px;
	}
	
	*::selection {
			background: transparent;
	}
              
            
!

JS

              
                //     ------ Yoshis Island ------
// Gerard Ferrandez - ge1doot - August 2005 (dhteumeuleu)
// GFX: from GBA Yoshi's Island TM (c)1995-2002 Nintendo

~ function() {
		'use strict';
		var map = [
				// ---- map definition ----
				{
						src: "oam20.gif",
						x: 0,
						y: -256,
						z: -30
				}, // big mountain
				{
						src: "oam22.gif",
						x: 0,
						y: -172,
						z: -30
				}, // house big mountain
				{
						src: "oam24.gif",
						x: 35,
						y: -256,
						z: -40
				}, {
						src: "oam24.gif",
						x: 35,
						y: -256,
						z: 0
				}, {
						src: "oam24.gif",
						x: -20,
						y: -256,
						z: -60
				}, // mountain
				{
						src: "oam8.gif",
						x: -40,
						y: -256,
						z: 0
				}, {
						src: "oam8.gif",
						x: 20,
						y: -256,
						z: -70
				}, // green talus
				{
						src: "oam3.gif",
						x: -40,
						y: -256,
						z: -25
				}, // red tower
				{
						src: "oam51.gif",
						x: -40,
						y: -256,
						z: -25,
						gr: 1
				}, // ground
				{
						src: "oam5.gif",
						x: -25,
						y: -256,
						z: -95
				}, // volcano
				{
						src: "oam32.gif",
						x: 60,
						y: -256,
						z: -60
				}, {
						src: "oam32.gif",
						x: 50,
						y: -256,
						z: 40
				}, {
						src: "oam32.gif",
						x: -40,
						y: -256,
						z: 40
				}, // hill
				{
						src: "oam19.gif",
						x: 80,
						y: -256,
						z: -70
				}, {
						src: "oam19.gif",
						x: 80,
						y: -256,
						z: -40
				}, {
						src: "oam19.gif",
						x: 60,
						y: -256,
						z: 60
				}, {
						src: "oam19.gif",
						x: -60,
						y: -256,
						z: 50
				}, {
						src: "oam19.gif",
						x: -60,
						y: -256,
						z: 20
				}, // small hill
				{
						src: "oam52.gif",
						x: 80,
						y: -256,
						z: -70,
						gr: 1
				}, {
						src: "oam52.gif",
						x: 60,
						y: -256,
						z: 60,
						gr: 1
				}, {
						src: "oam52.gif",
						x: -60,
						y: -256,
						z: 50,
						gr: 1
				}, // green ground
				{
						src: "oam14.gif",
						x: 50,
						y: -256,
						z: -20
				}, // grey donjon
				{
						src: "oam51.gif",
						x: 50,
						y: -256,
						z: -20,
						gr: 1
				}, // ground
				{
						src: "oam14.gif",
						x: 0,
						y: -256,
						z: 10
				}, // grey donjon
				{
						src: "oam50.gif",
						x: 0,
						y: -256,
						z: 10,
						gr: 1
				}, // castle water
				{
						src: "oam11.gif",
						x: -12,
						y: -256,
						z: 10
				}, {
						src: "oam11.gif",
						x: 12,
						y: -256,
						z: 10
				}, {
						src: "oam11.gif",
						x: 0,
						y: -256,
						z: -2
				}, {
						src: "oam11.gif",
						x: 0,
						y: -256,
						z: 22
				}, // grey towers
				{
						src: "oam28.gif",
						x: 60,
						y: -256,
						z: 15
				}, // towers with red roof
				{
						src: "oam17.gif",
						x: 50,
						y: -256,
						z: -80
				}, // dolmen
				{
						src: "oam25.gif",
						x: 65,
						y: -256,
						z: 30
				}, {
						src: "oam25.gif",
						x: 85,
						y: -256,
						z: 30
				}, {
						src: "oam25.gif",
						x: 70,
						y: -256,
						z: 10
				}, {
						src: "oam25.gif",
						x: 70,
						y: -256,
						z: -20
				}, // oranges
				{
						src: "oam10.gif",
						x: 0,
						y: -200,
						z: -70
				}, {
						src: "oam10.gif",
						x: 20,
						y: -180,
						z: -70
				}, {
						src: "oam10.gif",
						x: 40,
						y: -170,
						z: -50
				}, {
						src: "oam10.gif",
						x: 40,
						y: -190,
						z: -30
				}, // cloud
				{
						src: "oam35.gif",
						x: -50,
						y: -160,
						z: -10,
						href: "https://codepen.io/ge1doot/"
				}, // cloud castle
				{
						src: "oam2.gif",
						x: -65,
						y: -256,
						z: -50
				}, {
						src: "oam2.gif",
						x: -45,
						y: -256,
						z: -50
				}, {
						src: "oam2.gif",
						x: -40,
						y: -256,
						z: -70
				}, {
						src: "oam2.gif",
						x: -65,
						y: -256,
						z: -30
				}, {
						src: "oam2.gif",
						x: -80,
						y: -256,
						z: -80
				}, {
						src: "oam2.gif",
						x: -80,
						y: -256,
						z: -20
				}, {
						src: "oam2.gif",
						x: -90,
						y: -256,
						z: 0
				}, // fir
				{
						src: "oam1.gif",
						x: -60,
						y: -256,
						z: -40
				}, {
						src: "oam1.gif",
						x: -90,
						y: -256,
						z: -40
				}, {
						src: "oam1.gif",
						x: -100,
						y: -256,
						z: -20
				}, {
						src: "oam1.gif",
						x: -90,
						y: -256,
						z: -60
				}, {
						src: "oam1.gif",
						x: -40,
						y: -256,
						z: -80
				}, {
						src: "oam1.gif",
						x: -60,
						y: -256,
						z: -60
				}, {
						src: "oam1.gif",
						x: -60,
						y: -256,
						z: -90
				}, // small fir
				{
						src: "oam23.gif",
						x: 60,
						y: -256,
						z: -40
				}, {
						src: "oam23.gif",
						x: 60,
						y: -256,
						z: -30
				}, {
						src: "oam23.gif",
						x: 60,
						y: -256,
						z: -90
				}, {
						src: "oam23.gif",
						x: 70,
						y: -256,
						z: -90
				}, {
						src: "oam23.gif",
						x: 50,
						y: -256,
						z: -95
				}, {
						src: "oam23.gif",
						x: 90,
						y: -256,
						z: -40
				}, // flower
				{
						src: "oam23.gif",
						x: 95,
						y: -256,
						z: -50
				}, {
						src: "oam23.gif",
						x: 95,
						y: -256,
						z: -30
				}, {
						src: "oam23.gif",
						x: 80,
						y: -256,
						z: -20
				}, {
						src: "oam23.gif",
						x: 80,
						y: -256,
						z: -10
				}, {
						src: "oam23.gif",
						x: 100,
						y: -256,
						z: -10
				}, {
						src: "oam23.gif",
						x: 100,
						y: -256,
						z: 0
				}, // flower
				{
						src: "oam6.gif",
						x: 30,
						y: -256,
						z: 30
				}, {
						src: "oam6.gif",
						x: 20,
						y: -256,
						z: 40
				}, {
						src: "oam6.gif",
						x: 20,
						y: -256,
						z: 60
				}, {
						src: "oam6.gif",
						x: -20,
						y: -256,
						z: 30
				}, {
						src: "oam6.gif",
						x: -20,
						y: -256,
						z: 50
				}, {
						src: "oam6.gif",
						x: -30,
						y: -256,
						z: 60
				}, {
						src: "oam6.gif",
						x: -10,
						y: -256,
						z: 90
				}, // tree
				{
						src: "oam9.gif",
						x: 30,
						y: -256,
						z: 45
				}, {
						src: "oam9.gif",
						x: 35,
						y: -256,
						z: 60
				}, {
						src: "oam9.gif",
						x: 45,
						y: -256,
						z: 70
				}, {
						src: "oam9.gif",
						x: 50,
						y: -256,
						z: 90
				}, {
						src: "oam9.gif",
						x: -20,
						y: -256,
						z: 90
				}, {
						src: "oam9.gif",
						x: -15,
						y: -256,
						z: 70
				}, {
						src: "oam9.gif",
						x: -10,
						y: -256,
						z: 35
				}, // small tree
				{
						src: "oam16.gif",
						x: 0,
						y: -256,
						z: 30
				}, {
						src: "oam16.gif",
						x: 0,
						y: -256,
						z: 40
				}, {
						src: "oam16.gif",
						x: 0,
						y: -256,
						z: 50
				}, {
						src: "oam16.gif",
						x: 0,
						y: -256,
						z: 60
				}, {
						src: "oam16.gif",
						x: 0,
						y: -256,
						z: 70
				}, // plots
				{
						src: "oam4.gif",
						x: -25,
						y: -200,
						z: -95,
						mz: 10
				}, {
						src: "oam4.gif",
						x: -25,
						y: -220,
						z: -95,
						mz: 10
				}, {
						src: "oam4.gif",
						x: -25,
						y: -210,
						z: -95,
						mz: 10
				}, // volcano smoke
				{
						src: "oam33.gif",
						x: -10,
						y: -172,
						z: -23
				}, {
						src: "oam33.gif",
						x: -15,
						y: -169,
						z: -21
				}, {
						src: "oam33.gif",
						x: -20,
						y: -166,
						z: -19
				}, {
						src: "oam33.gif",
						x: -25,
						y: -163,
						z: -17
				}, {
						src: "oam33.gif",
						x: -30,
						y: -160,
						z: -15
				}, // chain
				{
						src: "oam38.gif",
						x: 20,
						y: -200,
						z: 40,
						mz: 2
				}, // seagull
				{
						src: "oam18.gif",
						x: 20,
						y: -256,
						z: 40
				} // Yoshi
		];
		// ----- private vars -----
		var o = [],
				ay = 2,
				sin = Math.sin(ay * Math.PI / 180),
				cos = Math.cos(ay * Math.PI / 180),
				k = 0,
				b1, b2;
		// ----- prototype object -----
		var CObj = function(p) {
				this.loaded = false;
				this.x = p.x;
				this.y = p.y;
				this.z = p.z;
				this.gr = p.gr || false;
				// ---- insert image -----
				this.img = document.createElement("img");
				this.img.src = p.src;
				if (p.href) {
						// ---- menu link -----
						var a = document.createElement("a");
						a.href = p.href;
						a.appendChild(this.img);
						scr.elem.appendChild(a);
						this.img.style.left = '0';
						this.css = a.style;
				} else {
						// ---- simple image -----
						scr.elem.appendChild(this.img);
						this.css = this.img.style;
				}
				// ---- vertical animation ----
				this.mz = p.mz || false;
				this.mzr = 0;
				// ---- ground ----
				this.gr = p.gr || false;
		};
		// ---- rotate function ----- 
		CObj.prototype.rotate = function() {
				if (this.mz) {
						this.mzr += 0.5;
						this.y += 0.5;
						if (this.mzr > this.mz) {
								this.y -= this.mzr;
								this.mzr = 0;
						}
				}
				var x1 = this.x * cos - this.z * sin;
				this.z = this.z * cos + this.x * sin;
				this.x = x1;
				var r = scr.width / (scr.width + this.z);
				if (this.loaded) {
						this.css.transform = this.css.webkitTransform = 'matrix(1,0,0,1,' +
								(scr.width * 0.5 + (2 * this.x * r) - (this.w0 * r) * 0.5) + ',' +
								(-scr.height - (2 * this.y * r) - (this.h0 * r)) +
								')';
						this.css.zIndex = this.gr ? 0 : Math.round(100000 - this.z * 100);
				} else {
						// ----- image loaded -----
						if (this.img.complete) {
								this.loaded = true;
								this.w0 = this.img.width;
								this.h0 = this.img.height;
								if (this.gr) this.h0 /= 1.5;
								this.css.left = '0';
								this.css.transform = this.css.webkitTransform = 'matrix(0,0,0,0,0,0)';
						}
				}
		};
		// ----- main loop -----
		var run = function() {
				// ---- RAF ----
				requestAnimationFrame(run);
				// ---- ay angle ----
				ay = (scr.width * 0.5 - pointer.x) / 100;
				ay = Math.min(1.2, Math.max(-1.2, ay));
				sin = Math.sin(ay * Math.PI / 180);
				cos = Math.cos(ay * Math.PI / 180);
				// ---- background scrolling ----
				b1.left = Math.round(k) + "px";
				b2.left = Math.round(k + 512) + "px";
				k -= ay * 2;
				if (k > 0) k -= 512;
				else if (k < -512) k += 512;
				// ---- rotate elements ----
				var i = 0,
						p;
				while (p = o[i++]) p.rotate();
		};

		// ---- screen ----
		var scr = {
				elem: document.getElementById("screen"),
				resize: function() {
						var o = this.elem;
						this.width = o.offsetWidth;
						this.height = o.offsetHeight;
						for (this.left = 0, this.top = 0; o != null; o = o.offsetParent) {
								this.left += o.offsetLeft;
								this.top += o.offsetTop;
						}
				}
		};
		scr.resize();

		// ---- pointer ----
		var pointer = (function(canvas) {
				var pointer = {
						x: 0,
						y: 0,
						canvas: canvas,
						isDown: false,
						pointer: function(e) {
								e.preventDefault();
								var touchMode = e.targetTouches;
								var pointer = touchMode ? touchMode[0] : e;
								this.x = pointer.clientX - this.canvas.left;
								this.y = pointer.clientY - this.canvas.top;
						},
				};
				[
						[window, 'mousemove,touchmove', function(e) {
								this.pointer(e);
						}],
						[canvas.elem, 'mousedown,touchstart', function(e) {
								this.pointer(e);
								this.isDown = true;
						}],
						[window, 'mouseup,touchend,touchcancel', function(e) {
								e.preventDefault();
								this.isDown = false;
						}]
				].forEach(function(e) {
						for (var i = 0, events = e[1].split(','); i < events.length; i++) {
								e[0].addEventListener(events[i], e[2].bind(pointer), false);
						}
				}.bind(pointer));
				return pointer;
		}(scr));
		scr.elem.onselectstart = function() {
				return false;
		}
		b1 = document.getElementById("bkg0").style;
		b2 = document.getElementById("bkg1").style;
		// ---- add some grass ----
		for (var i = 0; i < 40; i++) {
				var r = Math.round(Math.random() * 180 - 90);
				var a = Math.random() * 2 * Math.PI;
				map.push({
						src: "oam27.gif",
						x: Math.round(r * Math.cos(a)),
						y: -256,
						z: Math.round(r * Math.sin(a))
				});
		}
		// ---- create objects ----
		for (var k = 0; k < map.length; k++) {
				o.push(
						new CObj(
								map[k]
						)
				);
		}

		// ---- start engine ----
		pointer.Xi = 50;
		run();

}();
              
            
!
999px

Console