# Reference

## Writing CSS Functions that write CSS from inside a xaringan R markdown document.
`xaringanthemer_font_default()` `style_xaringan()` | Write A Customized Xaringan Theme
`style_extra_css()` | Add Extra CSS Styles
## xaringan Themes Parameterized styles for xaringan slides using one (mono) or two (duo) base colors. Bonus: slide styles based on the solarized color palette.
`style_mono_accent()` | Monotone Accent Theme
`style_mono_accent_inverse()` | Monotone Accent Inverse Theme
`style_mono_dark()` | Monotone Dark Theme
`style_mono_light()` | Monotone Light Theme
`style_duo()` | Duotone Theme
`style_duo_accent()` | Duotone Accent Theme
`style_duo_accent_inverse()` | Duotone Accent Inverse Theme
`style_solarized_dark()` | Solarized Dark Theme
`style_solarized_light()` | Solarized Light Theme
## Google Fonts Helper functions for using Google Fonts in your slide styles.
`google_font()` | Specify Google Font
`google_language_codes()` | List Valid Google Language Codes
## ggplot2 Themes Plot themes for ggplot2 to match your xaringanthemer slide styles.
`theme_xaringan()` | A Plot Theme for ggplot2 by xaringanthemer
`theme_xaringan_inverse()` | An Inverse Plot Theme for ggplot2 by xaringanthemer
`theme_xaringan_base()` | The ggplot2 xaringanthemer base plot theme
`theme_xaringan_set_defaults()` `theme_xaringan_restore_defaults()` | Set and Restore ggplot2 geom Defaults
`scale_xaringan_discrete()` `scale_xaringan_fill_discrete()` `scale_xaringan_color_discrete()` `scale_xaringan_colour_discrete()` `scale_xaringan_continuous()` `scale_xaringan_fill_continuous()` `scale_xaringan_color_continuous()` `scale_xaringan_colour_continuous()` | Themed ggplot2 Scales
## Helper functions Helpers for Google fonts and color adjustments.
`theme_xaringan_get_value()` | Get the Value of xaringanthemer Style Setting
`lighten_color()` `darken_color()` | Generate lighter or darker version of a color
`apply_alpha()` | Add alpha to hex color
`choose_dark_or_light()` | Choose dark or light color