#nav_bar{
	box-shadow: 0px 30px 70px -10px #000;
	background-image: url(images/Nav_grad.png);
	height: 60px;
	position: fixed;
	margin-left: auto;
	margin-right: auto;
	width: 100%;
	top: 165px;
	min-width: 740px;
}