.center-div 
{
	margin: 0 auto;
	width: 1000px;
	text-align: center;
}

h1 {
	text-align: center;
	}
	
h2 {
	text-align: center;
	}
	
h3 {
	text-align: center;
}
	
table, th, td {
	border: 1px solid black;
	vertical-align: center;
	padding: 10px;
}
table {
	display: inline-table;
	margin-bottom: 100px;
	}
	
tr:nth-child(even) {
	background-color: #f2f2f2;
	}

tr:hover:nth-child(odd) {
	background-color: #f5f5f5;
}
tr:hover:nth-child(even) {
	background-color: #ffffff;
}

th {
	background-color: #4cAF50;
	color: white;
	}

.footer {
	position: fixed;
	left: 0;
	bottom: 0;
	width: 100%;
	background-color: #4cAF50;
	color: white;
	text-align: center;
}