body {
	margin: 0px;
	text-align: center;
}
a.active {
	color: #ccc;
	border-bottom: 3px solid white;
}
div.nav {
	padding: 60px;
	position: fixed;
	z-index: 1;
	width: 100%;
	margin: 0px;
	top: 0px;
	width: 95%;
	background-color: #0c3358;
	height: 0px;
	box-shadow: 0px 5px 20px black;
}
.logo {
	float: left;
	margin-top: -15px;
	font-weight: bold;
	font-size: 37px;
	text-decoration: none;
	color: #ccc;	
}
div.nav a:not(.logo) {
	float: right;
	color: white;
	padding: 20px;
	padding-bottom: 40px;
	margin-top: -22px;
	margin-right: 20px;
	font-weight: bold;
	text-decoration: none;
}
div.nav a:hover:not(.logo) {
	color: #ccc;
}
div.main_header {
	background-image: url('https://media.wired.com/photos/5a593a7ff11e325008172bc2/master/pass/pulsar-831502910.jpg');
	width: 100%;
	margin-top: -300px;
	height: 970px;
	background-repeat: no-repeat;
}
.header_heading {
	color: black;
	padding: 30px 30px;
	background: linear-gradient(to bottom right,white,#0c3358);
	/*background: linear-gradient(to bottom right,red,blue);*/
	/*background-color: gold;*/
	/*filter: brightness(250%);*/
	margin-top: 300px;
	width: 400px;
	font-weight: bold;
	font-size: 60px;
}