No, that didn’t make a difference. I checked the page source and the additional CSS is included in the page head. I tried changing the widths to 80% and 20% but that didn’t change anything.
As it turns out, Comodo (my SSL CA) provides code snippets for displaying their logo. I’ve gone ahead and done that, using the “Insert Headers and Footers” plugin. The logo appears inline in the page footer (vs. the theme footer), but that’s good enough for now.
Thanks for your help. It’s no longer necessary to resolve this issue, although I’d still like to know how to do it in case I have that requirement in the future.
Note – in the browser, the CODE you posted is cut off (only the .copyright style is showing). I was able to see both styles in the email, however.