.modal.fade {
    transition: opacity 0.2s ease-in-out;
    opacity: 0;
}

    .modal.fade.show {
        opacity: 1;
    }

.modal-backdrop.fade {
    transition: opacity 0.2s ease-in-out;
    opacity: 0;
}

    .modal-backdrop.fade.show {
        opacity: 0.7;
    }