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.

Create a section for your CSS style sheet in the header of your HTML page. Link to an external CSS style sheet as an alternative for larger stylesheets.

How to Get the Navigation Bar Under the Header in CSS. When you're coding a new website layout, it sometimes can be tricky to get the different elements in the exact positions you want.