html{
 background: url(images/portada.jpg) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

div.menu
{
width: 75%;
margin-left:auto;
margin-right:auto;
}
ul
{
width:100%;
list-style-type: none;
text-align: center;
font-family:"Courier","courier new";monospace;}
li {

margin: 0.25em;
padding:0.5em;
display:inline;
font-size: 0.80em;
font-weight: bold;}

a:link,a:visited
{color:#FFFFFF;
background-color:#9E0505;
padding:0.7em;
text-align:center;
text-decoration:none;}
a:hover,a:active 
{background-color:#520404;}