Hi fellow students. Anyone else studying at night? You might like this free open source program NightPDF. (https://www.funkyspacemonkey.com/nightpdf-an-open-source-dark-mode-pdf-reader)
You download it, drop your eloquent javascript pdf and voilá, your eyes will be thanking you 
See screenshot below. Hope it helped, happy studying everyone.
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Looks pretty cool Claudio. Thanks for the recommendation.
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