R ggplot, remove white margins in ggsave/ggplot

Question

How can I remove the white margins in ggsave?

My question is exactly the same as Remove white space (i.e., margins) ggplot2 in R. However, the answer there isn\'t ideal

Answer 1

Found the answer from Remove Plot Margins in ggplot2

theme(plot.margin=grid::unit(c(0,0,0,0), "mm"))

does the job