7.5 Mixins and functions

7.5.1 Mixins

• Acts as template of reusable properties
• Returns CSS
• Starts definition with @mixin
• Use with @include directive

See example from the book.

7.5.2 Functions

• Perform calculations–with mathematical operations, which is not possible in CSS
• Returns values to be used used in CSS rules
• Define with @function directive
• Use with function name (and, if applicable, arguments) inside CSS rule

See example from the book.