#box {
	width:800px;
	height:800px;
	border-radius:50%;
	margin:0px auto;
	position:relative;
	top:100px;
}
.second {
	width:180px;
	height:100px;
	position:absolute;
	color:black;
	font-weight:bolder;
	text-align:center;
	font-size:40px;
}
.one {
	width:180px;
	height:20px;
	background:black;
	margin-bottom:5px;
}
.two {
	width:180px;
	height:20px;
	margin-bottom:5px;
	overflow:hidden;
}
.two:before {
	display:block;
	content:"";
	background:black;
	width:85px;
	height:20px;
	float:left;
}
.two:after {
	display:block;
	content:"";
	background:black;
	width:85px;
	height:20px;
	float:right;
}
.box-taiji {
	width:0;
	height:400px;
	position:absolute;
	left:50%;
	top:50%;
	margin-top:-200px;
	/* 高度的一半 */
            margin-left:-200px;
	/* 宽度的一半 */
            border-left:200px solid #000;
	border-right:200px solid #fff;
	box-shadow:0 0 30px rgba(0,0,0,.5);
	border-radius:400px;
	animation:rotation 2.5s linear infinite;
	-webkit-animation:rotation 2.5s linear infinite;
	-moz-animation:rotation 2.5s linear infinite;
}
.box-taiji:before,.box-taiji:after {
	position:absolute;
	content:"";
	display:block;
}
.box-taiji:before {
	width:200px;
	height:200px;
	top:0;
	left:-100px;
	z-index:1;
	background-color:#fff;
	border-radius:50%;
	box-shadow:0 200px 0 #000;
}
.box-taiji:after {
	width:60px;
	height:60px;
	top:70px;
	left:-30px;
	z-index:2;
	background-color:#000;
	border-radius:50%;
	box-shadow:0 200px 0 #fff;
}
@keyframes rotation {
	0% {
	transform:rotate(0deg);
}
100% {
	transform:rotate(-360deg);
}
}@-webkit-keyframes rotation {
	0% {
	-webkit-transform:rotate(0deg);
}
100% {
	-webkit-transform:rotate(-360deg);
}
}@-moz-keyframes rotation {
	0% {
	-moz-transform:rotate(0deg);
}
100% {
	-moz-transform:rotate(-360deg);
}
}