Align legend with plot axis

tidyverse
1

I want to align the legend in a plot with the plotting area. I've tried many alterations of this MWE

library(ggplot2)

g <- ggplot(mtcars) +
  geom_col(aes(x = cyl, y = mpg, fill = as.factor(am))) +
  theme(
    legend.position = "top",
    legend.justification = "center",
    legend.background = element_rect(fill = c("#f2f0f2"), colour = NA),
    legend.margin = margin(t = 0, r = 1, b = 0, l = 0, unit = "npc"),
    complete = T
  ) +
  theme(plot.background = element_rect(fill = "white", colour = NA))

g

However, it doesn't align as I need, and I obtain this result:

image
image1190×691 10.3 KB

How can I do that? This looks so complicated, and I tried all of the StackOverflow-related posts with no success.

The final idea should be this

image10
image103096×2205 111 KB

3

@Yarnabrina Hi. I updated the post to reflect the final result

4

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