Nikita Gorskikh enhanced the AdguardTeam/KnowledgeBase repository by consolidating and improving documentation for CSS injection and element hiding rules in CoreLibs 1.18+. Focusing on Markdown and technical writing, Nikita provided practical examples and clarified best practices, including guidance on when to use dedicated CSS rules versus element hiding. The work included updates to syntax highlighting and language specifier usage, improving documentation rendering and readability. Through a series of lint and content edits, Nikita raised the overall quality and consistency of the documentation, addressing onboarding friction and reducing the risk of misconfiguration for users integrating CSS-based solutions in AdGuard products.