3D FlipBook - css files

Hi Ivan,

which file should I edit to change the color of the navbar ? I use this shortcode in a WP Page : [3d-flip-book mode="fullscreen" urlparam="fb3d-page" id="102" title="false" classes="fb3d-h-800"] I try in black-book-view.css, in short-black-book-view.css, white-book-view.css, in short-white-book-view.css with any results. Thank you in advance for your help. Regards, Barbara