You might notice some differences between style sheets in NationBuilder and in platforms like Drupal or WordPress. This is because NationBuilder uses an extension of CSS3, called SCSS, or Sassy CSS. This extension (with files ending with .scss) allows for concise styling that is still very similar to and works alongside traditional CSS.
If you are ready to dive in with CSS3 and SCSS, take a look at this site for tutorials and more.
If you need an introduction to traditional CSS, check out Design*Sponge for a great guide. This article uses a WordPress site as an example, but the same CSS will work in NationBuilder. Pretty great, right?
As always, I'm a total CSS nerd and would love to help you out with your design and styling. The best part? Help is just a couple of clicks away!