.tre {width: 850px; vertical-align: top;}
.due {width: 200px; vertical-align: top;}
body {background-color: #000066;}
.uno {width: 1050px; background-color: #FFFFFF;}
.quattro {text-align: center;}
div {text-align: center;}
a.hover {text-decoration: underline;}
a.visited {text-decoration: none;}
a {text-decoration: none; color: black; font-family: calibri; }
a.alfa {text-decoration: none; color: #000066; }
h1 {text-align: center; font-family: calibri; font-size: 30px;}
p {font-family: calibri; font-size: 15px;}
ul {font-family: calibri; font-size: 15px;}
h2 {font-family: calibri; font-size: 20px; color: #3399FF}
.quattro {color: red;}