Home button on a keyboard, tap the top of the screen on iOS, and I believe Android implements something similar.

I agree with the other commenter here. If a text-only article follows the tenets of some version of 'minimalist' design, I should be able to read it comfortably on my phone. Straight to reader mode for me.

I tried it on my desktop, where it was better. But I still wouldn't call it 'minimalist.' Again, it's just an article, but the background image draws my eyes away from the text. The top and sidebars do too, but to a lesser extent.

That's fine, but it's not minimalism. If I hear that an article on the web has been presented in a minimalist style I'm going to click on it assuming that once I start in on the article that's all I'm going to notice.