Default Browser Styles - Björn Wärmedalwarmedal.se/~bjorn/posts/2021-11-13-default-browser-styles.html
Apart from that I rely very much on how browsers present my site, from the default font and size to the paragraph distance and the emoji set used. HTML was actually made to be responsive. It's a reflowing format that theoretically works on any screen size. But of course that won't be the case when there's things like sidebars or banners and stuff. And there pretty much always is.