Worked on modernizing the CSS guidelines for the thoughtbot/guides repository, focusing on aligning documentation with current CSS-first standards and removing outdated Sass references. The update introduced BEM-based examples and comprehensive typography guidelines to improve consistency and readability for front end teams. Collaborated closely with other contributors to ensure thorough code review and knowledge sharing throughout the process. Addressed linting issues and refined code quality by standardizing naming conventions and nesting practices. The work was implemented using CSS and front end development skills, resulting in clearer, more maintainable guidelines that support cross-team adoption and reinforce best practices in modern CSS development.