[Feature request] Pop-up border

[Thisisausename]

Checklist (Your issue will be automatically closed if you delete this part)

• I make sure that there are no existing issues - open or closed - which I could contribute my information to.

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** Description
(Start here)
I often usw track when i usw Pop Up of where my Screen ist i doing what ever one and what the Video Player ist
EG Black wallground on App im useing and Dark YT Video
A potional setting to make a little (Insert color Code)-border
Around the Pop Up would be really nice
Maybe even a tranpercy for the Border
Or the effect Windos uses Like the little dark space around it
Thank you