* {
	margin:0;
	padding:0;
}
body {
	background-color:#ccc;
}
.taiji {
	width:150px;
	height:300px;
	margin:100px auto;
	border-right:150px solid #000;
	background-color:#fff;
	border-radius:150px;
	animation:rotate 2s infinite linear;
}
.taiji::before,.taiji::after {
	content:'';
	margin-left:50%;
	display:block;
	width:50px;
	height:50px;
	background-color:#fff;
	border:50px solid #000;
	border-radius:75px;
}
.taiji::after {
	background-color:#000;
	border:50px solid #fff;
}
@keyframes rotate {
	from {
	}to {
	transform:rotate(-360deg);
}
}