you can have you're css inside you're html by having a inline style <style type="text/css"> <style> or you can have a Link extension to you're css file <link href=â€main.css†rel=â€stylesheet†media=â€screen, projection†type=â€text/css†/>
I tried doing this, no luck. In wordpress admin, under theme editor. I tried that on the main template. which is index.php. When that didn't work I tried it on stylesheet which is style.css. everything aside from stylesheet is .php. Maybe that is helpful?