.invalid-feedback {
    display: none;
    width: 100%;
    margin-top: 0.25rem;
    font-size: .875em;
    color: #dc3545;
}

.is-invalid~.invalid-feedback, .is-invalid~.invalid-tooltip, .was-validated :invalid~.invalid-feedback, .was-validated :invalid~.invalid-tooltip {
    display: block;
}

.valid-feedback {
    display: none;
    width: 100%;
    margin-top: 0.25rem;
    font-size: .875em;
    color: #198754;
}

.is-valid~.valid-feedback, .is-valid~.valid-tooltip, .was-validated :valid~.valid-feedback, .was-validated :valid~.valid-tooltip {
    display: block;
}