I've updated the code and now slideshow works with buttons: jsfiddle
I've removed call for animation: imageAnimation 24s linear infinite 0s;
on <span>
elements(slide show background images) and on .cb-slideshow li div
where some text is shown with different timing respect his background. Now I have the slide show with auto play(who doesn't work correctly) and manual transition by the buttons, who works fine like I would've in my question.