Flexdashboard Theme / Navigation bar color change.

[technobrat]

Hi,

Taking a look on how to change the appearance of flexdashboard.

Looking at the instructions from:

https://rmarkdown.rstudio.com/flexdashboard/using.html#appearance

I noticed I can change the theme and looking further took me here, where I found the Sandstone theme with a nice color (let's say the second "grey" option).

https://bootswatch.com/sandstone/

I created a simple flexdashboard script to test these out:

---
title: "Theme/ Color Testing"
output: 
  flexdashboard::flex_dashboard:
    theme: sandstone
    orientation: columns
    vertical_layout: fill
  

---

The above generates a flexdashboard with horrible green theme, how can I change it to look like on the below link.

https://bootswatch.com/sandstone/

How can I change the navigation bar color to match that Bootswatch: Sandstone look (second option, kind of grey).

I have no CSS experience, hence why I'm a little lost.

Thanks for the time.