html,body {
  background-color: #999;
  margin: 0;
  padding: 0;
  height: 100%; }

body {
  font-family: Tahoma, sans-serif;
  font-size: 76%;
  text-align: center; }

div#container {
  margin-top: 0;
  margin-right: auto;
  margin-bottom: 0;
  margin-left: auto;
  position: relative;
  height: 100%; }

body>div#container {
  height: auto;
  min-height: 100%; }

div#content {
  margin-left: auto;
  width: 900px;
  margin-top: 2%;
  height: 540px;
  margin-right: auto; }
.rosso{
  color: red;
  font-weight: bold;  
 }