This is pure aesthetic, but I think that histograms look better without border. It is actually really easy to remove the black border that is set by default into the hist function.
Just add False to the border argument !
# Create data
my_variable=c(rnorm(1000 , 0 , 2) , rnorm(1000 , 9 , 2))
# Draw the histogram with border=F
hist(my_variable , breaks=40 , col=rgb(0.2,0.8,0.5,0.5) , border=F , main="")
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