CSS and HTML Basics

I've been spending some time recently helping people out with their websites and I thought I'd post a few tips on CSS basics.

Let's cover the difference between ID and Class when we're talking about CSS.


  • IDs should be unique per page.
  • IDs are selected with the "#" symbol


  • Classes can be shared, multiple elements can have the same class.
  • Classes are selected with the "." (period)

You can combine them and select a class and a specific id.

Use Firebug to help you debug your website on the fly, then transfer the changes to your style.css (or other) stylesheet.

Further (and better) reading:

  • The Difference between ID and Class.
  • Selector reference guide:
  • Multiple ID & Class selectors:

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