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HTML 

              
                <body id="top">

	<header>
		<h1>Backrooms UI</h1>

		<nav>
			<div class="nav-wrap">
				<a href="#"><span>What?</span></a>
				<a href="#"><span>Where?</span></a>
				<a href="#"><span>Why?</span></a>
				<a href="#"><span>How?</span></a>
				<a href="#"><span>Help!</span></a>
			</div>
		</nav>
	</header>

	<main>

		<div class="column-wrap">
		<div class="box main-box" style="height: 300px;">
			<div class="box-inner">
				<div class="box toggler frame">
					<div class="screw"></div>
					<div class="toggler-inner" data-toggle="top"></div>
				</div>
			</div>
		</div>
			<div class="box main-box" style="height: 300px;">
			<div class="box-inner">
				<div class="box toggler frame">
					<div class="screw"></div>
					<div class="outlet"></div>
					<div class="outlet"></div>
				</div>
			</div>
		</div>
		</div>
		
		<div class="box main-box" style="width: 650px;">
			<div class="box-inner">

				<div class="box frame">
					<h3>"Have you seen them?"</h3>
					<p>Tales from others who have wandered the digital backrooms. Share your stories, find clues, and remember - trust no one fully.</p>
					<a class="button" href="#">Read</a>
					<a class="button alt" href="#">Submit</a>
				</div>

				<div class="box-wrap">
					<div class="hinge left"></div>
					<div id="audio" class="box open-left">
						<div class="screw right"></div>

						<h3>Audio Logs</h3>
						<p>Hear the whispers and cries from those who've delved too deep. They may offer advice, or they might lead you astray.</p>
						<a class="button" href="#" data-toggle="audio">Listen</a>
						<a class="button alt" href="#" data-toggle="audio">Record</a>
					</div>
				</div>

			</div>
		</div>

	</main>
</body>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css2?family=Sometype+Mono:ital,wght@0,400;0,700;1,400;1,700&display=swap');

:root {
	--bg: #fef5b9;
	--box: #fced97;
	--light: #fffbaf;
	--dark: #825a48;
	--body: #251418;
	--alt: #918d61;
}

* {
	box-sizing: border-box;
}

::selection {
	background: var(--body);
	color: var(--bg);
}

html {
	overflow-x: hidden;
}

body {
	margin: 0;
	padding: 0 0 20px 0;
	position: relative;
	background: var(--bg);
	color: var(--body);
	width: 100%;
	min-height: 100vh;
	font-family: 'Sometype Mono', monospace;
	background-image: url("https://assets.codepen.io/5896374/seamless-yellow-carpet.jpg");
	overflow-x:hidden;
	transition: all 0.3s steps(3);
}

body::before {
	content: "";
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background: black;
	z-index: 999;
	opacity: 0;
	pointer-events: none;
	transition: inherit;
}

body.toggled::before {
	opacity: 0.5;
	mix-blend-mode: color-burn;
}

main {
	display: flex;
	flex-wrap: wrap;
	width: 1050px;
	margin: auto;
	max-width: 100%;
}

.box {
	margin: auto;
	max-width: 100%;
	display: grid;
	padding: 20px;
	position: relative;
	border-radius: 10px;
	border: 2px solid;
	background: var(--box);
	box-shadow: 5px 5px 3px inset rgba(255, 255, 255, 0.65),
		5px 10px 10px 5px inset var(--light), -6px -6px 1px inset var(--dark),
		3px 3px 0 rgba(0, 0, 0, 0.1), 5px 5px 0 rgba(0, 0, 0, 0.1),
		7px 7px 0 rgba(0, 0, 0, 0.1), 9px 9px 0 rgba(0, 0, 0, 0.1);
}

.box-wrap {
	position: relative;
}

.main-box {
	width: 300px;
	min-height: 300px;
	max-width: 92%;
	margin: 20px auto;
}

.box::after {
	content: "";
	position: absolute;
	top: 0;
	left: 0;
	height: 100%;
	width: 100%;
	z-index: 1;
	border-radius: inherit;
	pointer-events: none;
}

.box-inner {
	padding: 20px;
	background: var(--alt);
	border-radius: 3px;
	border: 2px solid;
	box-shadow: 2px 2px 5px inset rgba(0, 0, 0, 0.5), -3px -3px 5px rgba(0,0,0,0.25), 4px 4px 5px rgba(255,255,255,0.75);
	position: relative;
	z-index: 3;
	max-width: 100%;
}

.box-inner::before {
	content: "";
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background: linear-gradient(
      45deg,
      var(--alt) 25%,
      transparent 25%,
      transparent 75%,
      var(--alt) 75%,
      var(--alt) 0
    ),
    linear-gradient(
      45deg,
      var(--alt) 25%,
      transparent 25%,
      transparent 75%,
      var(--alt) 75%,
      var(--alt) 0
    ),
    rgba(0, 0, 0, 0);
  background-size: 10px 10px, 10px 10px;
  background-position: 0px 0, 5px 5px;
	filter: brightness(0.8);
	opacity: 0.25;
	mix-blend-mode: multiply;
}

.box.toggler {
	height: 100%;
	width: 150px;
	align-content: center;
}

.box.frame::before {
	content: "";
	position: absolute;
	top: 10px;
	left: 10px;
	width: calc(100% - 22px);
	height: calc(100% - 22px);
	border: 2px solid;
	border-radius: 5px;
	pointer-events: none;
}

.box-inner .box:not(.toggler) {
	margin-bottom: 20px;
	display: block;
}

.box-inner .box:last-of-type {
	margin-bottom: 0;
}

.toggler-inner {
	width: 55px;
	height: 110px;
	border: 2px solid;
	border-radius: 3px;
	margin: auto;
	background-image: linear-gradient(to bottom, var(--box) 0%, var(--box) 20%, var(--bg) 30%,var(--light) 60%, var(--dark) 95%);
	box-shadow: 0 0 3px 3px inset var(--bg),3px 3px 0 rgba(0, 0, 0, 0.1), 5px 5px 0 rgba(0, 0, 0, 0.1),
		7px 7px 0 rgba(0, 0, 0, 0.1);
	position: relative;
	cursor: pointer;
	transition: all 0.2s steps(2);
	transform: perspective(400px);
	transform-style: preserve-3d;
}

.toggler-inner::before {
	content: "";
	background: inherit;
	transform-style: preserve-3d;
	transform: perspective(500px) rotateX(35deg);
	position: absolute;
	top: calc(-12% - 2px);
	left: -2px;
	width: 100%;
	height: 112%;
	transition: inherit;
	border: 2px solid;
	border-radius: inherit;
	box-shadow: inherit;
	transition: inherit;
}

.toggler-inner::after {
	content: "";
	position: absolute;
	top: 100%;
	left: -5%;
	height: 70%;
	width: calc(110% + 5px);
	border-radius: inherit;
	background: black;
	opacity: 0.3;
	filter: blur(2px);
	transform: skewx(20deg) translatex(25%);
	pointer-events: none;
	transition: inherit;
}

.toggler-inner.active::before {
	transform: perspective(500px) rotateX(-35deg);
	top: -3%;
}

.toggler-inner.active::after {
	height: 20%;
	transform: skewx(20deg) translatex(10%);
	width: 110%;
}

nav {
	width: 100%;
	border-top: 2px solid;
	margin-bottom: 20px;
	border-bottom: 2px solid;
	text-align: center;
	background: var(--light);
	position: sticky;
	top: 0;
	z-index: 9;
}

nav::before {
	content: "";
	box-shadow: 5px 5px 3px inset rgba(255, 255, 255, 0.65),
		5px 10px 10px 5px inset var(--light), -6px -6px 1px inset var(--dark),
		3px 3px 0 rgba(0, 0, 0, 0.1), 5px 5px 0 rgba(0, 0, 0, 0.1),
		7px 7px 0 rgba(0, 0, 0, 0.1), 9px 9px 0 rgba(0, 0, 0, 0.1);
	position: absolute;
	top: 0;
	left: -20px;
	width: calc(100% + 40px);
	height: 100%;
	z-index: -1;
	pointer-events: none;
}

.nav-wrap {
	display: flex;
	width: calc(100% - 20px);
	max-width: 1000px;
	margin: 0 auto;
}

nav a {
	padding: 10px;
	flex-grow: 1;
	color: inherit;
	text-transform: uppercase;
	font-weight: bold;
	text-decoration: none;
	border-right: 2px solid;
	transition: all 0.15s steps(2);
}

nav a:first-of-type {
	border-left: 2px solid;
}

nav a:focus,
nav a:hover {
	background: var(--light);
	box-shadow: -2px -2px 2px 2px inset rgba(255, 255, 255, 0.5),
		2px 2px 1px 2px inset var(--dark);
}

nav a:focus {
	filter: brightness(0.9);
}

nav a span {
	display: inline-block;
	transition: inherit;
}

nav a:focus span,
nav a:hover span {
	transform: translatey(3px);
}

h1 {
	width: 100%;
	text-align: center;
	text-transform: uppercase;
	margin: 0;
	padding: 20px;
}

h2, h3, h4 {
	margin: 0.5em 0;
}

h3 {
	border-bottom: 2px solid;
	padding-bottom: 0.5em;
}

.button {
	background: var(--body);
	max-width: max-content;
	display: inline-block;
	font-weight: bold;
	border: 1px solid transparent;
	color: var(--light);
	text-decoration: none;
	text-transform: uppercase;
	letter-spacing: 0.05em;
	padding: 0.5em 1em;
	border-radius: 3px;
	box-shadow: 0.2em 0.2em 0.2em 0.1em inset var(--dark), 0.2em 0.2em 0.2em rgba(0,0,0,0.25);
	transition: all 0.2s steps(2);
}

.button:hover {
	color: var(--bg);
	background: var(--dark);
	box-shadow: -0.2em -0.2em 0.2em 0.1em inset var(--body), 0.2em 0.2em 0.2em rgba(0,0,0,0.25);
}

.button:focus {
	background: var(--dark);
	box-shadow: 0.2em 0.2em 0.2em 0.1em inset var(--body);
}

.button.alt {
	background: var(--bg);
	color: var(--body);
	box-shadow: 0em 0em 0em 0.1em inset rgba(0,0,0,0), 0.2em 0.2em 0.2em rgba(0,0,0,0.25);
	border-color: currentcolor;
}

.button.alt:hover {
	background: var(--light);
}

.button.alt:focus {
	box-shadow: 0.2em 0.2em 0.2em 0.1em inset rgba(0,0,0,0.25);
}

.screw {
	position: absolute;
	height: 100%;
	top: 0;
	width: 18px;
	left: calc(50% - 9px);
}

.screw::after,
.screw::before {
	position: absolute;
	width: 18px;
	height: 18px;
	border: 2px solid;
	border-radius: 100%;
	background: linear-gradient(160deg, #d4d4d4 0%, #825a48 35%, #825a48 40%, #251418 40%, #251418 60%, #825a48 60%, #825a48 65%, #d4d4d4 100%);
	box-shadow: 3px 3px 3px rgba(0,0,0,0.3), 3px 3px 3px inset rgba(255,200,200,0.25), -3px -3px 3px inset rgba(0,0,0,0.25);
}

.screw::before {
	content: "";
	top: 18px;
}

.screw::after {
	content: "";
	bottom: 18px;
	transform: rotate(85deg);
		box-shadow: 3px -3px 3px rgba(0,0,0,0.3), 3px -3px 3px inset rgba(255,200,200,0.25), -3px 3px 3px inset rgba(0,0,0,0.25);
}

.screw.right {
	left: unset;
	right: 20px;
}
.screw.left {
	left: 20px;
}

.hinge {
	position: absolute;
	top: 20px;
	width: 16px;
	height: calc(100% - 40px);
	border-radius: 3px;
	border: 2px solid;
	background: linear-gradient(0deg, #a28b81 0%, #825a48 40%, #825a48 45%, #251418 45%, #251418 55%, #825a48 55%, #825a48 60%, #a28b81 100%);
	background-size: 30px 30px;
	box-shadow: 3px 3px 3px rgba(0,0,0,0.3), 3px 3px 3px inset rgba(255,200,200,0.25), -3px -3px 3px inset rgba(0,0,0,0.25);
}

.hinge.left {
	left: -8px;
	box-shadow: -3px 3px 3px rgba(0,0,0,0.3), 3px 3px 3px inset rgba(255,200,200,0.25), -3px -3px 3px inset rgba(0,0,0,0.25);
}

.hinge.right {
	right: -8px;
}

.open-left {
  position: relative;
	transform: perspective(1000px) rotateY(0deg);
	transform-origin: left center;
  transition: transform 1s steps(10);
}

.open-left.toggled {
  transform: perspective(1000px) rotateY(-92deg);
}

.open-left.toggled a::before {
	content: "";
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	max-width: unset;
	background: black;
	opacity: 0.05;
}

.open-left .screw {
	transform: scalex(100%) translatex(0%);
	transition: transform 0.5s steps(5);
}

.open-left.toggled .screw {
	transform: scalex(500%) translatex(-70%);
	transition-delay: 0.5s;
}

.column-wrap {
	margin: 0 auto;
	max-width: max-content;
}

.outlet {
	border: 2px solid;
	width: 60px;
	height: 50px;
	margin: 5px auto;
	background: var(--light);
	border-radius: 40% 40% 50% 50%;
	box-shadow: 3px 3px 3px rgba(0,0,0,0.25), 3px 3px 3px inset rgba(0,0,0,0.15), -3px -3px 3px inset rgba(255,255,255,0.5);
	position: relative;
}

.outlet::before {
	content: "";
	position: absolute;
	top: 10px;
	left: 15px;
	background: var(--body);
	width: 6px;
	height: 16px;
	border-radius: 3px;
	box-shadow: 19px 0;
}

.outlet::after {
	content: "";
	position: absolute;
	left: 22.5px;
	bottom: 7px;
	width: 10px;
	height: 10px;
	background: var(--body);
	border-radius: 90% 90% 3px 3px;
}
!

JS 

              
                document.addEventListener('DOMContentLoaded', () => {
  function toggle() {
    // Look for any element with the 'data-toggle' attribute
    const elements = document.querySelectorAll('[data-toggle]');
    
    elements.forEach((element) => {
      element.addEventListener('click', (event) => {
        event.preventDefault();
        
        const targetID = element.getAttribute('data-toggle');
        const targetElement = document.getElementById(targetID);
        
        // Toggle the class 'toggled' on the targeted element
        targetElement.classList.toggle('toggled');
        
        // Toggle the class 'active' on the clicked element
        element.classList.toggle('active');
      });
    });
  }
  toggle();
});
!
999px

Console