Modifying `jlcode.sty` with Beamer/BeamerPoster frames

I am creating a Beamer presentation in which I am presenting some Julia code. By marking each frame as fragile, the styling looks great and goes edge to edge for a really nice finish. See screenshot
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However, instead of the usual 4:3 aspect ratio of Beamer slides, I am using BeamerPoster to create a bigger 16:10 slides. This works great and can contain a lot more information, except the styling for the Julia code. The stylized box does not go from edge to edge and and considers only the width of the original 4:3 beamer slide. See attached figure.
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Is there a way to modify the Latex style file to have the stylized box go edge to edge?