#nav_out{
	height: 40px;
	width: 100%;
	background: pink;
	position: fixed;
	top: 0;
	left: 0;
	box-shadow: 0 0 2px;
}
#nav_out .nav{
	width: 1000px;
	height: 40px;
	line-height: 40px;
	margin: 0 auto;
}
#nav_out .nav ul li{
	padding: 0 20px;
	height: 40px;
	float: left;
	transition: all 0.5s;
}
#nav_out .nav ul li a{
	color: #3e3e3e;
	text-decoration: none;
}
#nav_out .nav ul li:hover{
	transform: rotate(360deg);
}