The following examples were built using texinfo 6.8 (haven't upgraded to 7 yet). No custom css is used.
Look at https://cmucl.org/docs/cmu-user/html/More-About-Types-in-Python.html#More-About-Types-in-Python on a mobile device. I'm using a Pixel 4 phone with both Chrome and Firefox. At the bottom, there are links for more sections. They are very tiny and almost unreadable. Now look at https://cmucl.org/docs/cmu-user/html/The-Values-Declaration.html. The code snippets (@example) are really tiny. And curiously, https://cmucl.org/docs/cmu-user/html/Advanced-Compiler-Use-and-Efficiency-Hints.html has the entire page in tiny font, including the heading and text. This seems really odd. In general, the pages look nice on mobile. Just menu items and examples seem to be using a really tiny font. -- Ray