[Theme: sydney

I’ve been trying to customize my content-single pages (posts) to change some spacing and some basic layout. Specifically the 100px padding below the title (example). I cant find the file to edit in the theme.

I’ve tried the plugin “What the file” but no luck. Any help or guidance on how to find the correct file to edit would be greatly appreciated. Is there a better way to the file a specific string is in? Its easy to find the string that needs changed through firebug or ctrl + u but I can never find the file in the theme documents.

As stated in the title the theme is “sydney”.