First, add the `xaringan-themer.css` file to the YAML header of your xaringan slides. ```yaml output: xaringan::moon_reader: lib_dir: libs css: xaringan-themer.css ``` Then, in a hidden chunk just after the knitr setup chunk, load **xaringanthemer** and try one of the [theme functions][theme-functions]. ````markdown ```{r xaringan-themer, include = FALSE}`r ""` library(xaringanthemer) style_mono_light( base_color = "#1c5253", header_font_google = google_font("Josefin Sans"), text_font_google = google_font("Montserrat", "300", "300i"), code_font_google = google_font("Droid Mono") ) ``` ```` ### Tab Completion **xaringanthemer** is Tab friendly -- [use autocomplete to explore][theme-settings] the [template variables][template-variables] that you can adjust in each of the themes! ### R Markdown Template in RStudio You can also skip the above and just create a *Ninja Themed Presentation* from the New R Markdown Document menu in RStudio.