Same as the Flat Dark theme by luckydye found here:
But in blue and with larger sliders (as they are difficult to work with otherwise in my experience).
Largely based on the Flat Dark theme, with updated colors and shading to better match the Twitch dashboard.
Download and extract contents to C:\Program Files\obs-studio\data\obs-studio\themes or wherever your OBS install resides.
Restart OBS and select the Material Dark theme from Settings >...
A Flat Dark Theme for OBS Studio.
How to install
1. Drag the zip file into your OBS Studio Theme Folder (...\obs-studio\data\obs-studio\themes).
2. Unpack files into the Themes folder.
For latest changes download from Github