I have set a custom font size for the site tile through the Appearance menu font extension in drupal. As such, when I view the page full-screen, the site title is the correct size, as I can see by inspecting the css:
However, when I shrink the browser window to below the threshold for tablet view, the font size increases:
This size continues to reduce as the window gets smaller, but never gets as small as the 'custom' font size.
Would it be possible to make the responsive css make the starting size that's defined in the font config, and then shrink from there?