Nope, that doesn't work as well. I tested it before finishing up the article a few days ago. If you put `<style>` in the `<body>`, it gets removed when the email is forwarded and it still looks like shit.
That's why I said "if you could". I know it's not valid HTML. For some reason, style tags are only allowed inside the <head/>. My point was that I find it strange that HTML in general has this limit and that script tags are allowed in the <body/> as well.
Browsers are actually okay with <style> tags in the <body> and apply the rules inside. Although MDN says they must be placed in the <head> [1]. Email clients seem to be a lot more restrictive, apparently. Or lazy.
Huh, I didn't know browsers are behaving this way these days. I believe I tried this several years ago and it didn't work. Or did I just read the standard? I'm not sure. Anyway, I always assumed it wouldn't work.