Thanks Tom! As it happens, the site I am working on required the Site Title to be reduced in size on mobile, which brought it down to being smaller in size than the Site Tagline on mobile. The title and tagline are both quite large for Desktop in this particular case. Under most circumstances the issue I am having on the mobile end probably wouldn’t happen.
I eventually brought down the Site Tagline to a smaller size on desktop to accommodate the situation, but it would have been better to have a mobile setting for that too.
Thank you for the CSS! GP is a great theme!