body {
	 min-width: 1000px;
	 max-width: 1920px;
	 font-family: "Helvetica", sans-serif;
	 background-color: grey;
	 display: block;
 }
   
header h1 {
	color: yellow;
	text-align: center;
	font-weight: bold;
	padding-top: 20px;
	padding-bottom: 20px;
} 

header h2 {
	color: yellow;
	font-style: italic;
	text-align: center;
	padding-bottom: 20px;
}  

nav {
	display: block;
	width: 25%;
	border-style: ridge;
	border-width: 10px;
	margin-left: 10px;
	float: left;
}

nav li {
	font-size: 150%;
	padding: 20px;
}

article {
	display: block;
	width: 30%;
	float: left;
	border-style: ridge;
	border-width: 10px;
	padding-bottom: 25px;
}

article p {
	padding: 20px;
}

aside {
	float: left;
	width: 40%;
}

table ,th ,td {
	width: 75%;
    margin-left:13%;
	border: 1px solid black;
}

table td{
	padding-top: 10px;
	padding-bottom: 10px;
}

table caption {
	font-size: 150%;
	font: bold;
}

ol li {
	padding-top: 5px;
	padding-bottom: 5px;
}

footer {
	position: absolute;
	right: 0;
	bottom: 0;
	left: 0;
	text-align: center;
}