Popup / Slide-In like on CORRECTIV?

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Hi everybody,

I really fell in love with the “Donation”-Animation on CORRECTIV.org.

It opens after a couple of Seconds on the Website and then stays on the bottom of the screen when clicked “Not now”.

Has anybody maybe an Codepen or Fiddle that exactly does this? Or an idea how to achieve something like this? 🙂

Thanks in Advance!

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