With ggplot2 and the theme() function we can change the graph theme settings with almost any setting we like. See: http://ggplot2.tidyverse.org/reference/theme.html
When we specifically look at plot.background within the theme setting, we can set the parameters with element_rect(), providing us with the tools to change colour, fill, etc.
However, I’m not sure how to set the parameters such that I can have rounded corners for the plot background
Any tips on achieving this?