<div class="parallax">
    <div class="parallax__layer parallax__layer__0">
        <img src="https://github.com/samdbeckham/blog/blob/master/dev/_assets/images/articles/firewatch/layer_0.png?raw=true" />
    </div>
    <div class="parallax__layer parallax__layer__1">
        <img src="https://github.com/samdbeckham/blog/blob/master/dev/_assets/images/articles/firewatch/layer_1.png?raw=true" />
    </div>
    <div class="parallax__layer parallax__layer__2">
        <img src="https://github.com/samdbeckham/blog/blob/master/dev/_assets/images/articles/firewatch/layer_2.png?raw=true" />
    </div>
    <div class="parallax__layer parallax__layer__3">
        <img src="https://github.com/samdbeckham/blog/blob/master/dev/_assets/images/articles/firewatch/layer_3.png?raw=true" />
    </div>
    <div class="parallax__layer parallax__layer__4">
        <img src="https://github.com/samdbeckham/blog/blob/master/dev/_assets/images/articles/firewatch/layer_4.png?raw=true" />
    </div>
    <div class="parallax__layer parallax__layer__5">
        <img src="https://github.com/samdbeckham/blog/blob/master/dev/_assets/images/articles/firewatch/layer_5.png?raw=true" />
    </div>
    <div class="parallax__layer parallax__layer__6">
        <img src="https://github.com/samdbeckham/blog/blob/master/dev/_assets/images/articles/firewatch/layer_6.png?raw=true" />
    </div>
</div>

<div class="warning">⚠️ Your browser does not support CSS Scroll-Linked Animations, so this demo won't work. If you're feeling adventurous use Chrome 89+ with “Experimental Web Platform Features” enabled. Alternatively you can <a href="https://codepen.io/samdbeckham/pen/OPXPNp" target="_top">check the original version by Sam Beckahm Mulligan</a>.</div>
@supports (animation-timeline: works) {
	.warning {
		display: none;
	}

	@scroll-timeline scroll-for-100vh {
		time-range: 1s;
		start: 0;
		end: 100vh;
		scroll-offsets: 0, 100vh;
	}

	@keyframes parallax {
		to {
			transform: translateY(var(--offset));
		}
	}

	.parallax__layer {
		animation: 1s parallax linear;
		animation-timeline: scroll-for-100vh;
	}

	.parallax__layer__0 {
		--offset: 100vh;
	}

	.parallax__layer__1 {
		--offset: 83vh;
	}

	.parallax__layer__2 {
		--offset: 67vh;
	}

	.parallax__layer__3 {
		--offset: 50vh;
	}

	.parallax__layer__4 {
		--offset: 34vh;
	}

	.parallax__layer__5 {
		--offset: 17vh;
	}

	.parallax__layer__6 {
		--offset: 0vh;
	}
}

* {
	box-sizing: border-box;
}

html,
body {
	background: #2d112b;
	margin: 0;
	padding: 0;
}

body {
	min-height: 200vh;
}

.parallax {
	background: #fedcc8;
	height: 100vh;
	overflow: hidden;
	position: relative;
}

.parallax__layer {
	position: absolute;
	top: 0;
	left: 50%;
	right: 0;
	bottom: 0;
	margin-left: -1500px;
}

.parallax__layer img {
	display: block;
	position: absolute;
	bottom: 0;
}

/* Show warning for older browser */
.warning {
	position: fixed;
	top: 1em;
	right: 1em;
	left: 1em;
	padding: 1em;
	border: 1px solid black;
	z-index: 9999;
	text-align: center;
	color: black;
	background: rgba(255 255 225 / 0.9);
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
		"Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
}
.warning a {
	color: blue;
	text-decoration: underline;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.