A:link{ text-decoration: none; color: black; }
A:visited{ text-decoration: none; color: black; }
A:hover{ Color: blue; background:#D7D7D7; text-decoration: none; }
body {background-image: url(immagini/gru01_1.jpg); background-repeat: no-repeat; background-attachment: fixed; background-position: top left; }
table {text-align: center; }