nav 
{
    display: flex;
    justify-content: center; 
    background-color: #064b26; 
    padding: 10px 0;
}

nav a 
{
    text-decoration: none;
    color: #ffffff;
    font-size: 16px;
    margin: 0 20px; 
    padding: 11px;
    font-weight: bold;
    text-transform: uppercase;
    position: relative; 
    transition: color 0.3s ease; 
}
nav a::after 
{
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0; 
    height: 2px;
    background-color: #000;
    transition: width 0.3s ease; 
}

nav a:hover::after 
{
    width: 100%; 
}

nav a:hover 
{
    text-decoration: none;
    color: #000;
}

.acquista 
{
    border: 2px solid #000; 
    padding: 10px 20px;
}

.acquista:hover 
{
    background-color: goldenrod; 
    transition: background-color 0.3s;
}