body{
	background: url("bg.jpg");
	
}
div.continut{
	background-color:lightblue;
	width: 1000px;
	min-height:800px;
	border: 1px solid black;
	margin: 0 auto;
	font-family: Arial, Helvetica, sans-serif;
}
div.header{
	float: left;
	height:500px;
	width: 100%;
	border: 1px solid black;
	background-image: url("coperta.jpg");
	background-size: 100% 100%;
	
}
navigationbar{
	position: relative;
	width: 100%;
	background-color: black;
	float: left;
	z-index:1;
}
navigationbar a{
	diplay: block;
	text-decoration: none;
	color:white;
	padding: 10px;
	float: left;
}
navigationbar a.active{
	background-color:#3c3c3c;
	color: black;
}
navigationbar a:hover:not(.active){
	background-color:gray;
}
table,th,td{ border-collapse:collapse;
	border: 1px solid black;
}