just started watching the linked vid and I noticed that your button icons are a bit low res. I have seen a vid a long time ago, where one indie dev, created a whole pack of icons for exactly this use, covers all systems / PC /consoles. It was so long ago, i cannot remember or find the video, however, I did a quick seach and found this, looks simlar, but i havent verified it.

https://www.reddit.com/r/unrealengine/comments/14n1si8/i_mad...

Cheers