.container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 5px;
    width: 200px;
}

.key {
    padding: 10px;
    text-align: center;
    cursor: pointer;
}

.key-zero {
    grid-column: 2; /* Occupa due colonne */
    text-align: center; /* Allinea al centro */
}

#msg_error {
    grid-column: span 3;
    text-align: center;
}

#display {
    grid-column: span 3;
    padding: 10px;
    text-align: center;
    border: 1px solid gray;
    font-size: 16px;
}

.verify-button {
    grid-column: span 3; /* Occupa tutte e tre le colonne */
    text-align: center;
}

.modal-backdrop {
    z-index: 1040;
}

.modal {
    z-index: 1050;
}