I need to make a Bootstrap Card on a player responsive on mobile and web.

Hello,
The frame that launches at the end of the video is not responsive and does not stay on the video player as I would like (it goes on the sidebar or at the bottom of the player when we change our browser size).
https://streamgg.com/ib/MGXUyxnnUe

Here is an example of what I would like:
https://www.clippituser.tv/c/lmpkbd
On this site the box is responsive on desktop and mobile.

Thank you.