HTML

<input type="checkbox" class="check slide" id="checked-slide">
<input type="checkbox" class="check fade" id="checked-fade">
<input type="checkbox" class="check push" id="checked-push">
<input type="checkbox" class="check pull" id="checked-pull">
<label class="switch slide" for="checked-slide"></label>
<label class="switch fade" for="checked-fade"></label>
<label class="switch push" for="checked-push"></label>
<label class="switch pull" for="checked-pull"></label>
<div class="gatefold">
	<header class="header">
		<h1>ヘッダー</h1>
	</header>
	<main class="contents">
		<section class="contents__inner">
			<h2>HTML</h2>
			<p>ここにコンテンツ</p>
		</section>
	</main>
	<footer class="footer">
		<p>フッター</p>
	</footer>
</div>
				

CSS

/* gatefold */
.gatefold {
	width: 100%;
	height: 100%;
}

.gatefold::before,
.gatefold::after {
	content: '';
	position: fixed;
	top: 0;
	width: 100%;
	height: 100vh;
	background: url(../images/gatefold.jpg) top center no-repeat;
	background-size: cover;
	-webkit-transition: all 1s;
	transition: all 1s;
	z-index: 1;
}

.gatefold::before {
	left: 0;
	clip: rect(0px 50vw 100vh 0px);
}

.gatefold::after {
	right: 0;
	clip: rect(0px 100vw 100vh 50vw);
}

/* contents */
.header,
.contents,
.footer {
	max-width: 1000px;
	margin: 0 auto;
	padding: 80px 0;
	text-align: center;
}

.contents {
	padding: 0;
}

.contents__inner {
	box-sizing: border-box;
	max-width: 680px;
	height: 100%;
	margin: 40px auto 0;
	padding: 20px;
	text-align: left;
	background: #eee;
}

.contents__inner h2 {
	padding: 10px;
	font-size: 20px;
	font-weight: bold;
	border-bottom: 1px solid #666;
}

.btn__box {
	text-align: center;
}

.btn__box a {
	display: inline-block;
	width: 250px;
	height: 50px;
	margin: 0 auto;
	line-height: 50px;
	font-size: 13px;
	color: #000;
	border: 1px solid #000;
}

/* checkbox */
.check {
	display: none;
}

.switch {
	position: fixed;
	left: 0;
	right: 0;
	width: 300px;
	height: 140px;
	margin: auto;
	font-size: 80px;
	font-weight: bold;
	text-align: center;
	cursor: pointer;
	text-shadow: 5px 5px 10px rgba(0,0,0,.8);
	color: #fff;
	-webkit-transition: all .5s;
	transition: all .5s;
	visibility: visible;
	opacity: 1;
	z-index: 2;
}

.switch.slide {
	top: 10%;
}
.switch.slide::before {
	content: 'slide';
	-webkit-transition: all .5s;
	transition: all .5s;
}

.switch.fade {
	top: 30%;
}
.switch.fade::before {
	content: 'fade';
	-webkit-transition: all .5s;
	transition: all .5s;
}

.switch.push {
	top: 50%;
}
.switch.push::before {
	content: 'push';
	-webkit-transition: all .5s;
	transition: all .5s;
}

.switch.pull {
	top: 70%;
}
.switch.pull::before {
	content: 'pull';
	-webkit-transition: all .5s;
	transition: all .5s;
}

.check.slide:checked ~ .switch.slide::before,
.check.fade:checked ~ .switch.fade::before,
.check.push:checked ~ .switch.push::before,
.check.pull:checked ~ .switch.pull::before {
	content: 'close';
	opacity: .3;
}
.check.slide:checked ~ .switch.push,
.check.slide:checked ~ .switch.fade,
.check.slide:checked ~ .switch.pull,
.check.fade:checked ~ .switch.slide,
.check.fade:checked ~ .switch.push,
.check.fade:checked ~ .switch.pull,
.check.push:checked ~ .switch.slide,
.check.push:checked ~ .switch.fade,
.check.push:checked ~ .switch.pull,
.check.pull:checked ~ .switch.slide,
.check.pull:checked ~ .switch.fade,
.check.pull:checked ~ .switch.push {
	visibility: hidden;
	opacity: 0;
}

.check.slide:checked ~ .gatefold::before {
	-webkit-transform: translate3d(-550px,0,0);
	transform: translate3d(-550px,0,0);
}
.check.slide:checked ~ .gatefold::after {
	-webkit-transform: translate3d(550px,0,0);
	transform: translate3d(550px,0,0);
}

.check.fade:checked ~ .gatefold::before {
	-webkit-transform: translate3d(-550px,0,0);
	transform: translate3d(-550px,0,0);
	opacity: 0;
}
.check.fade:checked ~ .gatefold::after {
	-webkit-transform: translate3d(550px,0,0);
	transform: translate3d(550px,0,0);
	opacity: 0;
}

.check.push ~ .gatefold::before,
.check.pull ~ .gatefold::before {
	-webkit-transform-origin: left center;
	-ms-transform-origin: left center;
	transform-origin: left center;
}
.check.push ~ .gatefold::after,
.check.pull ~ .gatefold::after {
	-webkit-transform-origin: right center;
	-ms-transform-origin: right center;
	transform-origin: right center;
}

.check.push:checked ~ .gatefold::before {
	-webkit-transform: perspective(1500px) rotateY(50deg);
	transform: perspective(1500px) rotateY(50deg);
}
.check.push:checked ~ .gatefold::after {
	-webkit-transform: perspective(1500px) rotateY(-50deg);
	transform: perspective(1500px) rotateY(-50deg);
}

.check.pull:checked ~ .gatefold::before {
	-webkit-transform: perspective(1500px) rotateY(-80deg);
	transform: perspective(1500px) rotateY(-80deg);
}
.check.pull:checked ~ .gatefold::after {
	-webkit-transform: perspective(1500px) rotateY(80deg);
	transform: perspective(1500px) rotateY(80deg);
}