#mainNav{ 
margin-top: 10px; 
padding: 5px; 
//background-color: #f1eff0; // Colore di sfondo 
border-top: 1px solid #FDBCB7; //  Colore del bordo superiore 
border-bottom: 1px solid #FDBCB7; // Colore del bordo inferiore 
} 
#mainNav ul{ 
margin: 0 auto; 
width: auto; 
text-align: center; 
} 

#mainNav li{
margin-right: 5px;
margin-bottom: 25px; 
font-size: 10px; // Dimensione dei caratteri 
text-transform: uppercase; 
}
@media only screen and (min-width: 900px) {
#mainNav li{
display: inline; 
margin-right: 5px;
margin-bottom: 30px; 
font-size: 15px; // Dimensione dei caratteri 
text-transform: uppercase; 
}}

@media only screen and (min-width: 1150px) {
#mainNav li{ 
display: inline; 
margin-right: 5px; 
margin-bottom: 30px; 
font-size: 20px; // Dimensione dei caratteri 
text-transform: uppercase; 
}}

#mainNav li:last-child{ 
margin-right: 0; 
} 
#mainNav a:link, 
#mainNav a:visited{ 
color: #003366; // Colore dei link e di quelli visitati 
white-space: nowrap; 
text-decoration: none;
background-color: #f1eff0;
padding: 10px;
} 
#mainNav a:hover, 
#mainNav a:active{ 
text-decoration: none;
background-color:#666;
color: #fff;
} 
#mainNav .current_page_parent a:link, 
#mainNav .current_page_parent a:visited, 
#mainNav .current_page_item a:link, 
#mainNav .current_page_item a:visited{ 
font-weight: bold; 
color: #114477; // Colore del link della pagina aperta 
} 
#mainNav .current_page_parent a:hover, 
#mainNav .current_page_parent a:active, 
#mainNav .current_page_item a:hover, 
#mainNav .current_page_item a:active{ 
color: #225588; // Colore del link della pagina aperta al passaggio del mouse 
}
.wrapper {
    position: relative;
    width: 100%;
    height:400px;
    <!-- border: 1px solid black; -->
}
img.centrale{
   position:absolute;
   top:50%;
   left:50%;
   -webkit-transform: translate(-50%,-50%); 
   -moz-transform: translate(-50%,-50%);
   -ms-transform: translate(-50%,-50%);
   -o-transform: translate(-50%, -50%);
   transform: translate(-50%,-50%);
}
img.menu{
margin: 0px 40px 40px 0px;
text-align:center;
}
#main-menu{
list-style-type:none;
text-align:center;
}
ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
}
.centro {
display:block;
margin:0px auto;
text-align:center;
}
img.centro{
max-width:70%;
}