Accordion gallery using the latest CSS3 'flexbox' styling

Hello!

I have found a very nice gallery – using CSS3:

https://www.cssplay.co.uk/menu/cssplay-flexbox-gallery.html

It looks nice on HTML pages. I would like to use it within WP, as well.
How can this be incorporated into a WP Page?

Thanks,

Tamas
p.s.
On Stu’s website there are many more interesting scripts… would be nice to be able to use any of them in WP…