When you want to make something awesome on the web, you have to start with HTML and CSS. With plenty of options, picking a good tutorial isn't always easy. Here are beginner and advanced lessons ...

For instance, if a class defines a width of 100 pixels, all DIVS referencing that class will be 100 pixels wide. You can override a DIV's CSS class definition by updating the DIV's HTML code.

Because of this, CSS is usually learned after or in tandem with HTML (and often JavaScript). Codecademy offers courses ranging from one to 115 hours, depending on your goals and current skill level.

Pure CSS offers a minimalist, mobile-first approach to CSS layouts in your web pages. Let's get started with this lightweight framework, which you can use as-is or extend with a variety of plugins.