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Lightbox open Video Button HELP PLEASE

my Problem is as follows: I want to open a video in a lightbox by clicking on a button. In this Picture I show you my testimonial design, an there should be a button below the Text which open the Video in a lightbox on my homepage. I m really new to Webflow and I have no Idea how to do this, can anyone help me with a solution?

Project Link:

Here is my public share link: LINK
(how to access public share link)