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HTML

              
                <main>
	<div class="layer layer--show layer--pristine">
		<div class="layer__roof"></div>
		<div class="layer__middle"></div>
		<div class="layer__base"></div>
	</div>
</main>
              
            
!

CSS

              
                * {
	border: 0;
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}
body {
	background:
		/* land */
		linear-gradient(0deg,#113f66 1.5em,#113f6600 1.5em),
		/* snow part of moutain */
		radial-gradient(100% 100% at center,#e1ecf4 49%,#e1ecf400 50%) calc(50% - 10em) calc(100% - 12em) / 14em 8em,
		radial-gradient(100% 200% at 50% 150%,#e1ecf4 49.75%,#e1ecf400 50%) calc(50% - 10em) calc(100% - 11em) / 55.5em 16em,
		radial-gradient(100% 200% at 50% 0%,#e1ecf4 49.75%,#e1ecf400 50%) calc(50% - 10em) calc(100% - 8em) / 48em 3em,
		/* mountain */
		radial-gradient(100% 100% at center,#5d6d7e 49.75%,#5d6d7e00 50%) calc(50% - 10em) calc(100% + 61em) / 80em 80em,
		/* clouds */
		radial-gradient(100% 100% at center,#fff 49%,#fff0 50%) calc(50% - 26em) calc(100% - 26em) / 12em 2em,
		radial-gradient(100% 100% at center,#fff 49%,#fff0 50%) calc(50% - 12em) calc(100% - 23em) / 12em 2em,
		radial-gradient(100% 100% at center,#fff 49%,#fff0 50%) calc(50% - 6em) calc(100% - 24em) / 12em 2em,
		radial-gradient(100% 100% at center,#fff 49%,#fff0 50%) calc(50% + 18em) calc(100% - 12em) / 18em 6em,
		radial-gradient(100% 100% at center,#fff 49%,#fff0 50%) calc(50% + 24em) calc(100% - 15em) / 18em 6em,
		radial-gradient(100% 100% at center,#fff 49%,#fff0 50%) calc(50% + 34em) calc(100% - 12em) / 18em 6em,
		radial-gradient(100% 100% at center,#fff 49%,#fff0 50%) calc(50% + 26em) calc(100% - 10em) / 18em 6em,
		/* sun */
		radial-gradient(100% 100% at center,#facd15 49.5%,#facd1500 50%) calc(50% - 18em) calc(100% - 22em) / 12em 12em,
		/* sky */
		linear-gradient(0deg,#86c1e9 20em,#7fb6db 20em 40em,#77abce 40em);
	background-repeat: no-repeat;
	font-size: 10px;
	height: 100vh;
}
main {
	position: fixed;
	bottom: 0;
	left: 50%;
	width: 20em;
	height: 10em;
	transform: translateX(-50%);
}

/* Layers */
.layer {
	position: absolute;
}
.layer > div {
	margin: auto;
	transform-origin: 50% 100%;
}
.layer__roof {
	background: linear-gradient(90deg,#37678d 50%,#10406f 50%);
	clip-path: polygon(20% 0%,80% 0%,100% 100%,0% 100%);
	-webkit-clip-path: polygon(20% 0%,80% 0%,100% 100%,0% 100%);
	width: 20em;
	height: 3em;
	transition:
		clip-path 0.15s ease-out,
		-webkit-clip-path 0.15s ease-out;
}
.layer__middle {
	background:
		/* side */
		linear-gradient(90deg,#0000 50%,#0004 50%),
		/* front left */
		linear-gradient(#bf2f2f 0.1em,#fff 0.1em) 0.2em 0.7em / 1.3em 0.7em,
		linear-gradient(#bf2f2f 0.1em,#fff 0.1em) 0.2em 1.7em / 1.3em 1.7em,
		linear-gradient(#bf2f2f 0.1em,#fff 0.1em) 0.2em 3.7em / 1.3em 1.7em,
		/* front middle */
		linear-gradient(#bf2f2f 0.1em,#fff 0.1em) 2em 0.7em / 1.4em 0.7em,
		linear-gradient(#bf2f2f 0.1em,#fff 0.1em) 1.8em 1.7em / 1.8em 4em,
		/* front right */
		linear-gradient(#bf2f2f 0.1em,#fff 0.1em) 3.9em 0.7em / 1.4em 0.7em,
		linear-gradient(#bf2f2f 0.1em,#fff 0.1em) 3.9em 1.7em / 1.4em 1.7em,
		linear-gradient(#bf2f2f 0.1em,#fff 0.1em) 3.9em 3.7em / 1.4em 1.7em,
		/* side left */
		linear-gradient(#bf2f2f 0.1em,#fff 0.1em) 5.7em 0.7em / 2.4em 0.7em,
		linear-gradient(#bf2f2f 0.1em,#fff 0.1em) 5.7em 1.7em / 2.4em 1.7em,
		linear-gradient(#bf2f2f 0.1em,#fff 0.1em) 5.7em 3.7em / 2.4em 1.7em,
		/* side right */
		linear-gradient(#bf2f2f 0.1em,#fff 0.1em) 8.4em 0.7em / 2.4em 0.7em,
		linear-gradient(#bf2f2f 0.1em,#fff 0.1em) 8.4em 1.7em / 2.4em 1.7em,
		linear-gradient(#bf2f2f 0.1em,#fff 0.1em) 8.4em 3.7em / 2.4em 1.7em,
		/* outer */
		linear-gradient(#bf2f2f 0.5em,#fa3e3e 0.5em);
	background-repeat: no-repeat;
	width: 11em;
	height: 6em;
}
.layer__base {
	background:
		linear-gradient(90deg,#0000 50%,#0003 50%),
		#ee9366;
	width: 12em;
	height: 1em;
}
.layer:first-of-type .layer__base {
	background:
		linear-gradient(90deg,#0004 25%,#0002 25%) 2em 0 / 2em 0.5em,
		linear-gradient(90deg,#0000 50%,#0003 50%),
		#ee9366;
	background-repeat: no-repeat;
}

/* Layer states */
.layer--show .layer__roof {
	animation: popOutA 0.15s ease-out forwards;
	animation-delay: 0.45s;
	transform: scale(0.55,0);
}
.layer--show .layer__middle,
.layer--show .layer__base {
	animation: popOutB 0.15s ease-out forwards;
	transform: scale(1,0);
}
.layer--hide .layer__roof {
	animation: popOutA 0.15s ease-out reverse forwards;
}
.layer--hide .layer__middle, 
.layer--hide .layer__base {
	animation: popOutB 0.15s ease-out reverse forwards;
}
.layer--show .layer__middle,
.layer--hide .layer__base {
	animation-delay: 0.3s;
}
.layer--show .layer__base,
.layer--hide .layer__middle {
	animation-delay: 0.15s;
}
.layer--hide .layer__roof,
.layer--hide .layer__middle, 
.layer--hide .layer__base,
.layer--show.layer--pristine div {
	transform: scale(1,1);
}
.layer--top .layer__roof {
	clip-path: polygon(50% 0%,50% 0%,100% 100%,0% 100%);
	-webkit-clip-path: polygon(50% 0%,50% 0%,100% 100%,0% 100%);
	transition-delay: 0.3s;
}
.layer--show.layer--pristine div {
	animation: none;
}

/* Animations */
@keyframes popOutA {
	from { transform: scale(0.55,0) }
	33% { transform: scale(0.55,1.2) }
	67% { transform: scale(1.2,0.9) }
	to { transform: scale(1,1) }
}
@keyframes popOutB {
	from { transform: scale(1,0) }
	50% { transform: scale(1,1.2) }
	to { transform: scale(1,1) }
}
              
            
!

JS

              
                window.addEventListener("DOMContentLoaded",app);

function app() {
	let main = document.querySelector("main"),
		createLayer = (pristine = false, forceTop = false) => {
			let layer = document.createElement("div"),
				layerRoof = document.createElement("div"),
				layerMiddle = document.createElement("div"),
				layerBase = document.createElement("div");

			layer.classList.add("layer","layer--show");

			if (pristine)
				layer.classList.add("layer--pristine");
			if (forceTop)
				layer.classList.add("layer--top");

			layer.style.bottom = `${(100 * main.children.length)}%`;

			layerRoof.classList.add("layer__roof");
			layerMiddle.classList.add("layer__middle");
			layerBase.classList.add("layer__base");

			main.appendChild(layer);
			layer.appendChild(layerRoof);
			layer.appendChild(layerMiddle);
			layer.appendChild(layerBase);
		},
		refreshHeight = () => {
			let layers = main.querySelectorAll(".layer"),
				totalHeight = main.offsetHeight * (main.children.length + 1),
				pristine = "layer--pristine",
				hide = "layer--hide",
				show = "layer--show",
				top = "layer--top";

			if (window.innerHeight > totalHeight)
				createLayer();

			layers.forEach((layer,i) => {
				let mainCompStyles = window.getComputedStyle(main),
					upperBound = -window.innerHeight + layer.offsetHeight;

				// over top
				if (layer.offsetTop < upperBound) {
					layer.classList.remove(pristine);
					layer.classList.remove(show);
					void layer.offsetHeight;
					layer.classList.add(hide);

				// inside
				} else if (layer.classList.contains(hide)) {
					layer.classList.remove(pristine);
					layer.classList.remove(hide);
					void layer.offsetHeight;
					layer.classList.add(show);
				}

				layer.classList.remove(top);
			});

			let shownLayers = main.querySelectorAll(`.${show}`);
			if (shownLayers.length > 0) {
				let lastShown = shownLayers[shownLayers.length - 1];
				lastShown.classList.add(top);
			}
		},
		initialLayers = Math.floor(window.innerHeight / main.offsetHeight) - 1;

	// layers on load
	while (initialLayers--) {
		createLayer(true,initialLayers == 0);
	}

	window.addEventListener("resize",refreshHeight);
}
              
            
!
999px

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