.btn {
    margin-top: 10px;
    margin-bottom: 10px;
}

.btn-primary, .btn-secondary, .btn-danger, .btn-warning, .btn-light {
    transition: background-color 0.3s ease;
}

.btn:hover {
    filter: brightness(90%);
}

.alert {
    margin-top: 20px;
}