How to add widget (that opens up) and sticks to the side of the screen?

laserbeampq
Excursionist
24 0 0

How can I add a widget that opens up with more information (and is placed on the side of the website)?

 

An example is this image. The "reviews" widget on the left side opens up when clicked and shows user reviews. It also sticks to the screen as the user scrolls ups and down. So, I'd like to do that too.

laserbeampq_0-1636141768405.png

Thanks!

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