The snippet was in the Customizer.php. I have removed it and the site is up and running again. Thanks for all the help!! 🙂 Check out my site if you have time, jackbowlby.com 🙂
I think I added it to ‘Appearance/Editor’ in my blog dashboard. I have searched through the files under ‘WordPress content/Themes/Sketch’ via ftp using cyberduck, and I can’t find the snippet anywhere…
Thanks, I have been learning about using ftp since your reply. I have downloaded the style.css from cyberduck and opening it in textwrangler, however I cannot seem to find this piece of code that caused the problem, it doesn’t appear to be there. I added it to the end of the editor in my wordpress admin page, is there a way to search for certain pieces of code in your style.css?