html {

background: url(images/OR.jpg) no-repeat center center fixed;

-webkit-background-size: cover;

-moz-background-size: cover;

-o-background-size: cover;

background-size: cover;

}
body {
margin-top: 50px;
}

.menu {
margin-top: 45px;
}

ul {
width: 700px;
padding: 15px;
margin: 0px auto 0px auto;
border-top: 4px solid #000;
border-bottom: 3px solid #000;
text-align: center;
}

li {
display: inline;
margin: 0px 3px;
}


a {
color: #ffffff;
text-transform: uppercase;
text-decoration: none;
font-weight: bold;
padding: 6px 18px 5px 18px;
}

a:hover {
color: #ffffff;
text-decoration: underline;
}

.xarxes {
margin-left: 500px; 
margin-top: 350px;
}