css3的transform设置动态效果

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>css3 Hover</title>
	<style type="text/css">
		.demo,.img,.border,.mask{
			width: 300px;
			height: 300px;
		}
		.demo{
			display: block;
			position: relative;
			margin:50px auto;
		}
		.img{
			background-repeat: no-repeat;
			background-size: cover;
			background-position: center center;
			border-radius: 50%;
		}
		.border{
			position: absolute;
			border: 10px solid #072256;
			border-left-color:#E07514;
			border-top-color:#E07514;
			top: 0;
			left: 0;
			border-radius: 50%;
			-webkit-transition:all .5s ease-in;
			transition:all .5s ease-in;
			-webkit-box-sizing:border-box;
			box-sizing:border-box;
		}
		.mask{
			position: absolute;
			top: 0;
			left: 0;
			border-radius: 50%;
			-webkit-transition:all .5s ease-in;
			transition:all .5s ease-in;
			color:rgba(255,255,255,0);
		}
		.demo:hover .mask{
			background-color:rgba(0,0,0,0.5);
			color:rgba(255,255,255,1);
		}
		.demo:hover .border{
			-webkit-transform:rotate(180deg);
			transform:rotate(180deg);

		}
		.info{
			position: absolute;
			width: 100%;
			top: 50%;
			left: 0;
			text-align: center;
			-webkit-transform:translateY(-50%);
		}

	</style>

</head>
<body>
	<a href="#" class="demo">
		<div class="img" style="background-image:url(http://ww3.sinaimg.cn/mw690/9c7cd2cdjw1e60hntjcq2j211y0lcq5e.jpg)"></div>
		<div class="mask">
			<div class="info">
				<h3>BEATIFUL DAY</h3>
				<p>Description goes here</p>
			</div>
		</div>
		<div class="border"></div>
	</a>
</body>
</html></pre>

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