What code need to add to work like in the video?

What code need to add to work like in the video? In familiar frameworks such as bootstrap , there is no such component. I think to write manually. Probably for some of them there are analogues
April 7th 20 at 11:08
2 answers
April 7th 20 at 11:10
It's no accident the adaptability of the site width?
https://runettex.clan.su/index/0-400

Hopefully correctly ponel

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