HTML/CSS Koans

Learn HTML and CSS by fixing broken code. Each exercise presents you with code that needs debugging. Fix the issues to match the target output and progress through increasingly challenging exercises.

Part A

Beginner and intermediate exercises covering basic HTML structure, common CSS properties, and fundamental debugging techniques.

  • 10 exercises
  • HTML tag fixes
  • Basic CSS styling
  • Form and input elements
Start Part A

Part C

Advanced exercises focusing on complex CSS layouts, responsive design, flexbox, grid, and advanced styling techniques.

  • 8 exercises
  • Flexbox layouts
  • CSS Grid
  • Responsive design
  • Advanced selectors
Start Part C