Cannot set `table-cell-padding` on "Lux" theme.

[TheFightMilk]

# Header
## Load packages
library(shiny)
library(tidyverse)
library(DT)
library(bslib)

ui <- navbarPage("Test",
                 inverse = T,
                 collapsible = T,
                 theme = bs_theme(
                   version = 4,
                   bootswatch = "lux",
                   "font-size-base" = "1rem",
                   "table-cell-padding" = ".4rem"
                 ),
                 tabPanel(
                   title = "Data Tables", 
                   id = "data",
                   icon = icon("flask"),
                   fluidRow(
                     dataTableOutput("DT1")
                   )
                   
                 )
                 
)

server <- function(input, output, session) {
  output$DT1 <- renderDataTable({
    datatable(mtcars, 
              style = "bootstrap4",
              options = list(info = F,
                             searching = T,
                             paging = T,
                             autoWidth = T,
                             scrollX = T),
              filter = list(position = 'top', clear = FALSE),
              class = 'cell-border stripe compact',
              rownames = F)
  })
  
}

##
shinyApp(ui, server)

The table cell padding doesn't change when adding BS4 variable "table-cell-padding" when using the "lux" theme. It works when I use some other theme e.g. "flatly". I want the cells to be more compact and tight around the numbers/column names.

[cpsievert]

Most bootswatch themes aren't very well integrated with Bootstrap Sass variables (in most cases they add hard coded CSS styles to achieve their custom styling), so it's not particularly surprising to me that this doesn't work how you'd expect it to (if you want to add cell padding, you'll probably have to bs_add_rules() to add additional CSS rules).