OP here: thanks for the feedback, added padding and correct scale. Should look better now!
+1 for using `ch` as your max-width unit and `rem` for your font size. Pixels is definitely the wrong value. I have my user agent set up with slightly larger default font size to be easier for me to read. I appreciate that you respect my settings using these relative values.
Also weirdly enough, browsers also can seem to go into reader-mode, to compensate. I've seen this before, but in this case it seems a little weird that reader mode wouldn't work.
This article is incorrectly scaled for mobile. There's no padding around the text so it butts up against the edge of my display. The line widths are way too long for comfortable reading. The blog entry also starts off with an unsemantic blockquote element that quotes nothing from a source.
But yes, Pandoc is a cool piece of software.