How to justify whole text in Rmd with bookdown::gitbook as output?

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1

I would like to justify all the text in my gitbook, but I couldn't find a solution. So far I've tried here but do not get anything

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2

How did you include the CSS in your gitbook() format ?

The link you shared worked for me
https://stackoverflow.com/a/56705806/3436535

following what is explained.