html {
	background-image: url("../images/robot-skull.jpg");
	background-color: #cccccc;
	height: 500px;
	background-position: center;
	background-repeat: no-repeat;
	background-size: cover;
	position: relative;
	font: 12px / 27px "PT Sans", Arial, sans-serif;
	text-align: center;
}
ul#nav_menu > li {
	display: inline-block;
	position: relative;
	margin-left: 10px;
	background: rgb(0, 34, 78);
	padding: 5px 20px;
	border-radius: 3px;
}
ul#nav_menu > li:first-child {
	margin-left: 0px;
}
ul#nav_menu li a {
	font-size: small;
	font-weight: 900;
	display: block;
	color: rgb(1, 213, 255);
	z-index: 1;
	position: relative;
}
ul#nav_menu ul {
	display: none;
	position: absolute;
	top: 90%;
	left: 14px;
	width: 9em;
	padding: 10px;
	z-index: 9999;
}
ul#nav_menu > li:hover {
	background: rgb(75, 107, 236);
}
ul#nav_menu > li:hover ul {
	display: block;
	margin-left: -1.2em;
	background: rgba(43, 5, 158, 0.749);
	box-shadow: 2px 2px 0 rgba(0,0,0,.5);
}
ul#nav_menu > li:hover ul li a {
	color: rgb(3, 182, 253);
}
ul#nav_menu > li:hover ul li a:hover {
	background: rgb(5, 66, 86);
	padding: 0 5px;
}