CSS Mastery transforms basic HTML into visually compelling, modern websites. Students explore the CSS box model, selectors, units, responsive design, typography systems, Flexbox, Grid layout, transitions, animations, and UI design concepts. Real-world exercises include creating multi-section landing pages, themed user interfaces, and mobile-friendly layouts. By the end, students will confidently control spacing, alignment, fonts, colors, and advanced layouts while developing a personal design workflow used by industry professionals.