Source (link to git-repo or to original if based on someone elses unmodified work): https://github.com/doncsugar/Genome-Spectrum/tree/master/plasmaThemes/classic/minimal/genome
A very bad theme.
This is a part of the Malice and Spite global themes.
It is somewhat color-compatible, but really only works well with light themes. May require a reload to properly update components.
System Settings > Workspace Behavior > Desktop Effects > Background Contrast
Background Contrast is recommended.