UI-Standardization people highly recommend Wikibase replaces usages of abandoned colors (for example blue: #347bff) with the WikimediaUI color palette colors (M82). It should be goodfirstbug.
Change 338400 had a related patch set uploaded (by Ladsgroup):
Replace abandoned colors in other projects beta feature image
Change 338400 merged by jenkins-bot:
Replace abandoned blue with #36c of other projects beta feature images