Hello, this is a new theme I made!
Matrix Theme OpenBullet 2
OB2 Version: 0.1.1 [Beta]
Author: Kaneda
Preview screenshot:
New version (2021-03-12 17:20) Adding the background-attachment: fixed
Matrix OB2 Theme
My little fix : 
If you want to have this item 
as mine, you need to modify the “open-iconic-bootstrap.min.css” (\wwwroot\css\open-iconic\font\css\open-iconic-bootstrap.min.css).
Simple as looking for “.oi-menu:before” and add “;color:#21D933”
