What Sass Mixins come included with NationBuilder?

How do I see the style entries that make up the mixins without applying them to my theme? For instance, how do I know what a fancy-button looks like?

Official response from Lilia Villa

SASS is an extension of CSS3, adding nested rules, variables, mixins, selector inheritance and more.  

Mixins are one of the most powerful Sass features. They allow re-use of styles – properties or even selectors – without having to copy and paste them or move them into a non-semantic class.

The mixins used in NationBuilder themes (gradient, border radius, box-sizing) come from Compass. You can learn more about them here: http://compass-style.org

'Fancy Buttons' is the only non-Compass mixin that has been added to NationBuilder. All the submit buttons use them by default. You can learn more about them here: http://brandonmathis.com/projects/fancy-buttons/

To use your own mixins in place of existing ones, you can just remove the @import and customize your own styles.