R’s default theme of the HTML help pages is too plain for me to read, but we can easily modify the theme, which is essentially a CSS file. You can find the file under:
file.path(R.home('doc'), 'html', 'R.css')
Simply replace this file with my version:
Download R.css (1K)
which looks like:
Of course you can design your own
R.css if you know CSS.