nav {
	text-align: center;
}
nav ul {
	background: #efefef77;
	background-image: linear-gradient(#130000, #efefef, #130000);
	box-shadow: 1px 1px 2px black, 0 0 25px blue, 0 0 5px darkblue;
	padding: 10px;
	border-radius: 15px;
	list-style: none;
	position: relative;
	display: inline-table;
	margin-top:-5px;
}
nav ul li {
	float: left;
}
.header_btn
{
	cursor:pointer;
	background-color:#2c0707;
	color:#00af75;
	border:0;
	height:42px;
	text-align:center;
	display:inline-block;
	font-size:20pt;
	font-weight:bold;
	margin:2px;
	padding:6px;
	padding-bottom:0px;
	border-radius:33%;
}