How do I learn to code in HTML and CSS on my Mac? Web design is one of the most useful skills you can learn, and it’s easy to learn HTML and CSS (the two main pillars of web pages) in Mac OS X.

Here's how Repl.it, an online coding platform, is bringing together kids from around the world and helping them learn to code and build projects.

Learn HTML and CSS online for free, and use them to create webpages or move up in your career.