Edit the space between axis ticks and axis labels in ggplot

I want to learn to increase the space between the axis.ticks and the axis labels.

Here is an example:

library(tidyverse)
library(palmerpenguins)

penguins %>% 
  ggplot() +
  geom_point(aes(x=bill_length_mm,bill_depth_mm, fill=species), size=5, shape=21, color="white", alpha=0.7) +
  scale_fill_manual(values=c("#1B6CA8","#D78E00","#438A5E" )) +
  guides(fill=guide_legend(override.aes = list(alpha=1))) +
  theme_bw() +
  theme(text=element_text(size=12), 
        axis.ticks.length = unit(0.25, "cm"))
#> Warning: Removed 2 rows containing missing values (`geom_point()`).

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^{Created on 2023-04-10 with reprex v2.0.2}

This is what I want:

I have tried to use the axis.text.x = element_text(margin = margin(t = 0,r = 0,b = 2,l = 0, unit="cm"))) but with this command, I am only moving the title. I only want to move the labels, NOT the title!

Thanks to the suggestion of Philippe Massicotte from the R4DS slack group here is a solution:

library(tidyverse)
library(palmerpenguins)

penguins %>% 
  ggplot() +
  geom_point(aes(x=bill_length_mm,bill_depth_mm, fill=species), size=5, shape=21, color="white", alpha=0.7) +
  scale_fill_manual(values=c("#1B6CA8","#D78E00","#438A5E" )) +
  guides(fill=guide_legend(override.aes = list(alpha=1))) +
  theme_bw() +
  theme(text=element_text(size=12), 
        axis.ticks.length = unit(0.25, "cm"), 
        axis.text.x = element_text(margin = margin(5,0,0,0)), 
        axis.text.y = element_text(margin = margin(0,5,0,0)))
#> Warning: Removed 2 rows containing missing values (`geom_point()`).

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^{Created on 2023-04-10 with reprex v2.0.2}