body {
  background-image: url("https://www.fontedivita.it/img/nuvole.jpg");
}

h3 {
    text-align: center;
}

#intestazione
{
 margin: auto;
 width: 95%;
 padding: 5px 5px 5px 5px;
 border: 2px solid #666666;
 border-radius: 5px; 
 color: #25383C; 
 text-align: center; 
 font-weight: normal;
 font-family: Arial;
 font-size: 20px; 
}

#contenuto 
{
 margin: auto;
 width: 95%; 
 padding: 5px 5px 5px 5px;
 background-color: #ffffff;
 border: 2px solid #666666;
 border-radius: 5px;  
 color: #222222; 
 text-align: justify;
 font-weight: normal;
 font-family: Arial;
 font-size: 20px; 
}

#menu
{
 margin: auto;
 width: 95%;
 padding: 5px 5px 5px 5px;
 font-weight: normal; 
 color: #000000; 
 text-align: center; 
 font-family: Arial;
 font-size: 20px; 
}

#fondo
{
 margin: auto;
 border: 0px solid #cccccc;
 padding: 5px 5px 5px 5px;
 color: #25383C; 
 text-align: center;
 font-weight: bold;
 font-family: Arial;
 font-size: 20px; 
}


a:link {
  background-color: yellow;
}

a:visited {
  background-color: cyan;
}

a:hover {
  background-color: lightgreen;
}

a:active {
  background-color: hotpink;
} 

a {
  text-decoration: none;
}