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CSS

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HTML 

              
                .overlays(style=`--start: ${Math.random() * 10};`)
	.overlay#overlay_sky
	.overlay#overlay_stars
	.overlay.overlay_sun#overlay_sun
		.overlay_sun-sun#overlay_sun-sun
	.overlay.overlay_sun#overlay_sun2
		.overlay_sun-sun#overlay_sun2-sun
	.overlay.overlay_sun#overlay_sun3
		.overlay_sun-sun#overlay_sun3-sun
	.overlay#overlay_floor
		#overlay_floor-color
		#overlay_floor-grid
		#overlay_floor-horizon
		#overlay_floor-horizon2
	.overlay.overlay_mountain#overlay_mountain
		.overlay_mountain-mountain#overlay_mountain-mountain
	.overlay#overlay_overlay
	
style.
	html *, html *:before, html *:after {
		animation: var(--annie, none);
	}
	@keyframes --a {
		0%, 5% { filter: hue-rotate(30deg); }
		95%, 100% { filter: hue-rotate(-120deg); }
	}
!

CSS 

              
                @property --annie {
	syntax: "*";
	inherits: false;
}
.overlays {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	width: 100vw;
	height: 100vh;
	z-index: -1;
	overflow: hidden;
	perspective: 900px;
	transform-style: preserve-3d;
	filter: hue-rotate(0deg);
	--annie_play-state: paused;
	--annie: --a 10s calc(-1s * var(--start)) infinite ease-in-out alternate var(--annie_play-state);
	
	&:active {
		--annie_play-state: running;
	}
	& .overlay {
		position: absolute;
		top: 0;
		left: 0;
		right: 0;
		bottom: 0;
	}
	& #overlay_sky {
		background-image:
			radial-gradient(circle at bottom, transparent 65%, #270245),
			linear-gradient(to bottom, #0000, #FF294166),
			linear-gradient(to bottom, #270245, #871A85)
		;
		background-size: cover, cover, cover;
	}
	& #overlay_stars {
		background-image:
			repeating-conic-gradient(#FFF2 0%, transparent .0002%, transparent .0045%, transparent .045%),
			repeating-conic-gradient(#FFF9 0%, transparent .0002%, transparent .0090%, transparent .090%),
			repeating-conic-gradient(#FFF6 0%, transparent .0002%, transparent .0075%, transparent .075%)
		;
		background-size: 100vmin 100vmin;
		filter: drop-shadow(0 0 .8vmin #FFF) drop-shadow(0 0 .2vmin #FFF) drop-shadow(0 0 .2vmin #FFF);
	}
	& .overlay_sun {
		display: flex;
		flex: 1;
		flex-direction: column;
		filter: drop-shadow(0 0 5vmin #FF2941) drop-shadow(0 0 7.5vmin #FE18D3);
		& .overlay_sun-sun {
			background-image:
				radial-gradient(circle at top, #FFF 0%, transparent 50%),
				radial-gradient(circle, transparent, #FE18D3),
				repeating-linear-gradient(#FF2941 0%, transparent 0.5%, #FF2941 1%),
				radial-gradient(circle, #FEFF38 0% 45%, #FF2941 85%, #FE18D3 100%)
			;
			box-shadow:
				inset 0vmin 0.5vmin 1vmin #FFF,
				inset 0vmin 1vmin 2vmin #FEFF38,
			;
			border-radius: 50%;
			width: 30vmin;
			height: 30vmin;
			position: absolute;
			left: 0;
			right: 0;
			top: 0;
			bottom: 0;
			margin: 0 auto;
			margin-top: 10vmin;
			-webkit-mask: linear-gradient(to bottom, #000 10% 15%, transparent 15% 15.25%, #000 15.25% 21%, transparent 21% 21.5%, #000 21.5% 27%, transparent 27% 27.75%, #000 27.75% 33%, transparent 33% 34%, #000 34% 39%, transparent 39% 40.5%, #000 40.5% 44%, transparent 44% 46%, #000 46% 50%, transparent 50% 52%, #000 52% 56%, transparent 56% 58%, #000 58% 62%, transparent 62% 64%, #000 64% 67%, transparent 67% 70%, #000 70% 73%, transparent 73% 76%, #000 76% 79%, transparent 79% 82%, #000 82% 84%, transparent 84% 88%, #000 88% 90%, transparent 90% 94%, #000 94% 95%, transparent 95% 100%);
		}
	}
	& #overlay_sun2, & #overlay_sun3 {
		filter: blur(5vmin);
		z-index: 1;
		transform: scale(1.5);
		transform-origin: top center;
	}
	& #overlay_sun3 {
		transform: scale(1.5) translateY(35%) translateZ(-1500px) rotateX(75deg);
		filter: blur(15vmin);
		z-index: 2;
		& .overlay_sun-sun {
			width: 90vmin;
			height: 90vmin;
		}
	}
	& #overlay_floor {
		width: 200%;
		transform: rotateX(70deg) translateX(-10%) translateY(50%);
		transform-style: preserve-3d;
		margin: 0 auto;
		z-index: 1;
		& #overlay_floor-color, & #overlay_floor-grid, & #overlay_floor-horizon, & #overlay_floor-horizon2, & #overlay_mountain {
			position: absolute;
			top: 0;
			left: 0;
			right: 0;
			bottom: 0;
		}
		
		& #overlay_floor-color {
			background-image: linear-gradient(to bottom, #270245CC, #871A85CC);
		}
		& #overlay_floor-grid {
			background-image:
				repeating-linear-gradient(to bottom, #FE18D3 0%, #0000 0.10% 1.90%, #FE18D3 2%),
				repeating-linear-gradient(to right, #FE18D3 0%, #0000 0.10% 1.90%, #FE18D3 2%)
			;
			background-size: 100vw 100vw;
			filter: drop-shadow(0 0 1vmin #FE18D3);
		}
		& #overlay_floor-horizon {
			background-image:
				linear-gradient(to bottom, #{adjust-color(#FE18D3, $lightness: 25)} 0%, transparent 30%),
			;
			background-size: cover;
			background-position: center;
			background-repeat:  repeat-x;
			box-shadow: 0 -1vmin 5vmin #FFF, 0 0 10vmin 2.5vmin #FE18D3;
		}
		& #overlay_floor-horizon2 {
			transform: translateZ(1vmin);
			box-shadow: inset 0 0 24vmin #FFFC, 0 0 32vmin #FFFC;
		}
	}
	& .overlay_mountain {
		transform-style: preserve-3d;
		filter: drop-shadow(0 0 24px #FFF9) drop-shadow(0 0 48px #FE18D3);
		& .overlay_mountain-mountain {
			background: linear-gradient(to bottom, #871A85, #270245, #FE18D3);
			width: 10000px;
			margin-left: -1500px;
			height: 100%;
			-webkit-mask-image: url("https://rockstarwind.github.io/codepen-footer/pen-assets/2022-01-27_has-5/mountain3.svg");
			-webkit-mask-position: 100% 0px;
			-webkit-mask-repeat: repeat-x;
			transform: rotateX(0deg) translateY(-200px) translateZ(-3000px);
		}
	}
	& #overlay_overlay {
		background-image:
			radial-gradient(circle at top, #FFF0 45%, #270245CC, #000),
			radial-gradient(circle at top, #FEFF3833 0%, #FF294133 15%, #0000)
		;
		background-size: cover;
		position: absolute;
		z-index: 1;
	}
}

body {
	background: #000;
	color: #FFF;
	font-family: "Helvetica", "Arial", sans-serif;
	
	&:not(:has(#rsw-footer)):before {
		content: "Put it back!";
		font-size: 20vmin;
		position: absolute;
		top: 0;
		left: 0;
		right: 0;
		bottom: 0;
	}
	&:not(:has(#rsw-footer)) * {
		display: none;
	}
}
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