How to achieve Sliding Date

Hi Everyone !!
Basically, when I went through the Github discussions and I saw a very very interesting thing !!
What I saw was the sliding date in the right-hand-side of the page!!

I have uploaded a photo of the thing I am mentioning to !!!

Can anyone guide me through this how to achieve a similar one? I have seen this in many other sites also !!!
I don’t know if there is a solution for this already. If there is one, please let me know !!

Unknown Coder

That is the Discourse “timeline” feature. You’ll want to look into people’s implementation of “timeline”.

Look at