a.btn-outline-primary{
    font-size: 25px;
    margin-right: 1em;
    background-color: #58151c;
    color: white;
    border-color: #58151c;
}

a.btn-outline-primary:hover,
a.btn-outline-primary:focus,
a.btn-outline-primary:active,
a.btn-outline-primary.show {
    background-color: white;
    border-color: #58151c;
    color: #58151c;
}

@media screen and (max-width: 768px) {
    .bottoni{
        display: flex;
        flex-direction: column;
    }

   a.btn-outline-primary{
        margin-bottom: 0.5em;
    }
}