white gap in new campaign

The best way to make changes like this to a theme is to use a child theme, so your tweaks won’t be overwritten when updating the theme. Here are some guides in case you haven’t made one before:
https://codex.wordpress.org/Child_Themes
http://op111.net/53/
http://vimeo.com/39023468

You should also check this out for customizing your site.
http://themesandco.com/snippet/firebug-best-spent-6-minutes/
http://getfirebug.com

Then to edit this editor is fantastic. You can edit multiple files at the same time.
http://notepad-plus-plus.org/

And this FTP program is tops in my book.
http://www.coreftp.com/