Earlier quoted context omitted.
I usually append /h/ to the URL (/mail/h/) and get a HTML version. It can work even without JS and it has classic design with small rows that works well on my small screen. No Material Design and no huge elements with large offsets.
this does not work for me. when I type "gmail.com" it redirects to: https://mail.google.com/mail/u/0/#inbox where should I put the /h/?
https://mail.google.com/mail/u/0/h/