... I send out a list of most interesting libraries and apps in the "CSS" section to about 1100 subscribers.
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This is a simple piece of CSS to add a scroll bar to long R outputs in Rmarkdown documents
CSS templates for R Markdown documents
Generate Academic Posters in R Markdown and CSS, inspired by 'reveal.js'
Paginate the HTML Output of R Markdown with CSS for Print
How to brand and automate your work with Rmarkdown