#contactAjaxForm .form-control.is-invalid,
#contactAjaxForm .form-select.is-invalid {
    border-color: #dc3545;
}

#contactAjaxForm .form-group > .invalid-feedback {
    display: none;
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.35rem;
    line-height: 1.4;
}

#contactAjaxForm .form-group > .invalid-feedback.is-visible {
    display: block;
}