endless-loop.css

body{
	margin: 0;
	padding: 0;
	background-color: #fff;

}

.box{
	position: absolute;
	top: calc(50% - 300px);
	left: calc(50% - 200px);
	transform: perspective(1000px) rotateY(-45deg);
	width: 400px;
	height: 600px;
	transform-style: preserve-3d;
}

.box:before{
	content: '';
	position: absolute;
	bottom: -100px;
	left: 0;
	width: 100%;
	height: 50px;
	background: #000;
	filter: blur(30px);
	opacity: 0.5;
	transform: rotateX(90deg);
}

.box div{
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	transform-style: preserve-3d;
	animation: ani 5s linear infinite;
}

.box div span{
	position: absolute;
	top: 0;
	left: 0;
	display: block;
	width: 100%;
	height: 100%;
	background: linear-gradient(0deg, #f1f1f1, #bbb, #f1f1f1);
	border-radius: 100%;
	border: 2px solid #fff;
}

.box div span:nth-child(1){
	transform: rotateX(0deg);
	background: url(endless-loop.jpg);
	background-size: cover;
}

.box div span:nth-child(2){
	transform: rotateX(45deg);
	background: url(endless-loop.jpg);
	background-size: cover;
}

.box div span:nth-child(3){
	transform: rotateX(-45deg);
	background: url(endless-loop.jpg);
	background-size: cover;
}

.box div span:nth-child(4){
	transform: rotateX(90deg);
	background: url(endless-loop.jpg);
	background-size: cover;
}

@keyframes ani{
	0%{
		transform: perspective(1000px) rotateX(0deg);
	}

	100%{
		transform: perspective(1000px) rotateX(360deg);
	}
}