The default color scheme for Shiny apps is bland.
Add some pizazz to your Shiny app by changing the color scheme. Shiny apps use bootstrap, so any bootstrap theme can be used easily.
Another option is to create your own color scheme.
https://rstudio.github.io/shinythemes/ https://gallery.shinyapps.io/117-shinythemes/
https://bootswatch.com/sketchy/
Select Color Palette
Create Custom Color Palette
Tell Shiny to use the theme
Copy the theme to the www directory, and specify that theme in the Shiny UI.
theme = “blah”