You can edit it however you want.
The monocons.css goes into:/jscripts/sceditor/editor_themes
The jquery.sceditor.monocons.css goes into:/jscripts/sceditor/textarea_styles
After you've put the files in their locations, go into your theme Templates & Styles > Themes > Your Theme
Then scroll down to find the option "Editor Style" & set that to monocons.
Files:
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