How to change styles and animations in FlipClock.js?

Question

css

The archive has a flipclock.css file, there are a lot of styles. I need radically new styles. Even if you find the right styles and replace them, there will still be many unused styles. How to be with them? And how can I change the animation of the counter? I just need to change the numbers (without flipping the scoreboard, as there). At the office The site did not find such an option.