body{
    
    font-family: Arial, Helvetica, sans-serif;
    color: white;
}
#marco{
       
    width: 1100px;
    margin: 0px auto;
    position: relative;
    z-index: 2;
   
    
}
nav ul li{    

    float: left;
    list-style: none;
    margin: 10px;
    
}
h4{
    color: white;
}

#medi{
    width: 400px;
}
#fiv{
    width: 500px;
}