Change Border Color of Border on Table- Kable

Question

I am trying to create borders around specific columns in R. I am able to do this using the kableExtra package (shown below)

iris <- datasets::iris

iris2 <- do.call(data.frame, aggregate(. ~ Species, iris, function(x) c(mean = mean(x), sd = sd(x))))

res2 <- kable(iris2,"html", col.names =  c("Species", "Mean", "SD", "Mean", "SD", "Mean", "SD", "Mean", "SD"),   align = c("r","c","c","c","c","c","c","c","c")) %>%
  kable_styling(bootstrap_options = c("striped", "hover")) %>%
  add_header_above(c(" " = 1, "Sepal Length" = 2, "Sepal Width" = 2, "Petal Length" = 2, "Petal Width" = 2))

print(res2)

res3<- column_spec(res2, c(2,4,6,8), border_left = TRUE, border_right = FALSE)

column_spec(res3, c(3,5,7,9), border_left = FALSE, border_right = TRUE)

This creates the border I would like in the right positions, but I would like them to be gray and not black. I tried using the 'color=' from the column_spec function but it turns the whole column gray and not just the border.

res3<- column_spec(res2, c(2,4,6,8), border_left = TRUE, border_right = FALSE, color = "#D8D7D7")
column_spec(res3, c(3,5,7,9), border_left = FALSE, border_right = TRUE, color = "#D8D7D7")

Any suggestions on how to change the border color would be helpful! For now, I am using getAnywhere() to see if I can just change the function slightly.

Answer 1

Use css into a border. This works

column_spec(res3, c(3,5,7,9), border_left = "2px solid gray",
            border_right = "2px solid gray")