Saw this theme on youtube, can't find it.

Saw this:
https://www.youtube.com/watch?v=nz3bRa-pkf0


i think it is awesome have been searching for it for a while can't find it :/

After a little bit of research, I have found it.
https://github.com/luizsan/ultimate
It seems that the youtuber who made that video actually made the theme.

how can i use this skin?