I have updated the style of my PHPBB3 forum, and would like to update the Artodia Mobile CSS file to match. It's nothing more complicated than a simple look-up and replace, but as soon as I alter a single character in the CSS file and upload it, the entire forum style gets broken. I just want to replace some HEX codes with new values. I've tried editing in notepad, Brackets and even Frontpage - it makes no difference. As soon as I change anything, the mobile style breaks. What am I doing wrong?