li a{
	font-family:"Arial Black",Gadget,sans-serif;
	font-size:20px;
	padding:5px;
}
li a:link{
	color:gray;
	text-decoration:none;
}
a:visited{
	color:gray;
	text-decoration:none;
}
li a:hover{
	color:black;
	text-decoration:underline;
	background-color: #B3B3B3;
}
li a:active{
	color:black;
	text-decoration:none;
}
hr{
	width:100%;
	max-width:800px;
}
ul {
	margin: 6px auto;
	padding-top:5px;
	padding-bottom:5px;
	padding-left:0px;
	padding-right:0px;
	width:100%;
	max-width:550px;
	list-style-type: none;
        overflow: hidden;
	background-color: #CFD0CF;
	border-top: 5px solid #757575;
	border-bottom: 5px solid #757575;
	border-radius: 10px;
}
li{
	display:inline;
}
header,nav,footer{
	text-align:center;
}
.iframe-container {
	position: relative;
	padding-bottom: 80%; /* 16:9 */
	height: 0;
}
.iframe-container iframe {
	border: 0;
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
}