R bslib change navbar color bootstrap version 5

Question

Why does changing the navbar color not work with BS version 4 and 5 in shiny (version 1.6.0.9022)?

Reproducible example:

app.R

library(shiny)
library(bslib)

theme_test <- bs_theme(version = 5,
                       primary = "#d83e3e") %>%
bs_add_rules(sass::sass_file("custom.scss"))

ui <- navbarPage(title = "Test", theme = theme_test)

server <- function(input, output) {}

shinyApp(ui, server)

custom.scss

.navbar { 
    background-color: $primary;
    color: $primary;
}

run

library(shiny)
runApp("FOLDERNAME")

Answer 1

After fiddling around a bit, I found the correct css/sass:

.bg-light, .navbar-default {
    background-color: $primary !important;
}