get-display-size does what I want but trying to draw a rectangle with (
rectangle 
<https://docs.racket-lang.org/teachpack/2htdpimage.html?q=2htdp%2Fimage#%28def._%28%28lib._2htdp%2Fimage..rkt%29._rectangle%29%29>
 
w h "solid" "black") renders a black screen with the top and left borders 
white. I tried to position the rectangle(with place-image and a few 
other)... then I gave up and started using racket/gui. It works great. 
Thank you for the help.

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