html, body {
	height: 100%;
	width: 100%;
	margin: 0;
	padding: 0;
	font-family: arial, sans-serif;
	text-align: center;
	margin-left: auto;
	margin-right: auto;
}

header {
	width: 100%;
    float: left;
	text-decoration: none;
    color: white;

}
nav > ul {
	list-style: none;
	margin: 0;
	padding: 0;
	display: flex;
	flex-direction: column;
	position: relative;
}

nav li {
	margin: 0.5em;
	padding: 0;
	font-size: 1.5rem;
	flex: 1 1 0%;
}

@media (min-width: 45em) {
	nav > ul {
		flex-direction: row;
		height: 3em;
	}
	nav li {
		flex: 1;
		font-size: 1em;
	}
}

nav a {
	display: block;
	padding: 0.4em;
	text-decoration: none;
	text-align: center;
	box-shadow: 0 5px 10px white inset;
	color: black;
	transition: all .25s ease-in;
	background-color: white;
}

nav li[aria-current] a {
	color: black;
/*	font-weight: bold;*/
}

nav a:focus,
nav a:hover,
nav li[aria-current] a:focus,
nav li[aria-current] a:hover {
	color: black;
	font-weight: bold;
	background-color: white;
}
/*     submenu navigation links      */

nav .submenu {
	visibility: hidden;
	height: 0;
	z-index: 1000;
}

nav .submenu li {
	display: block;
	/* width: 15em; */
}
/**     Show the submenu on hover, focus     **/

nav li:hover .submenu,
nav li:active .submenu,
nav li:focus .submenu {
	visibility: visible;
	height: auto;
}

nav li:focus-within .submenu {
	visibility: visible;
	height: auto;
}
article
{
  text-align: center;
}
table {
	height: 100%;
	width: 100%;
	margin: 0;
	padding: 0;
	font-family: arial, sans-serif;
	text-align: center;
	margin-left: auto;
	margin-right: auto;
}
footer
{
	text-align: center;
	background-color: gray;
	text-decoration: none;
	color: white;
}