Full Home Assistant configuration files can be found here.
Download the slate.yaml file from inside the themes directory here to your local themes directory.
Make sure to add themes: !include_dir_merge_named themes under frontend: in your config.yaml like so:
frontend:
themes: !include_dir_merge_named themes
Restart Home Assistant and select your theme by clicking on your user's profile circle in the bottom left.
Recommended colors for graphs, bars, etc.
- Blue: #2980b9
- Yellow: #b58e31
- Red: #b83829
- Green: #70a03c