SOURCE

	<div class="box">
		<div class="box1"></div>
		<div class="box2">快来鼠标悬浮吧</div>
		<div class="box3"></div>
	</div>
</body>

		.box{
			width: 1000px;
			margin: 100px auto;
		}
		.box div{
			width: 300px;
			height: 150px;
			border:1px solid #000;
			background-color: red;
			float: left;
			margin-right: 30px;
		}
		div:nth-child(2) {
               background-color: pink;
               transition: all 2s linear 0s;

		}
		div:nth-child(2):hover {
			transform: rotate(-360deg);
		}