Buttons in Cirrus come with some basic styling to help you get started. You can choose some of the different variants of buttons shown below or you can use the utility classes to customize it yourself.
Cirrus comes in quite a few different shades of colors. Below are some of the preset styles that you can use for your button that are core to the framework.
Use color utility classes defined here for more customization. Cirrus automatically uses a hover color depending on your selected color's luminosity. Lighter backgrounds get darker on hover while the opposite occurs for darker backgrounds.