The ckeditor editor window for the site content areas has a blue background to match the website so that the client sees a true representation of the website while adding content.
When “show blocks” is selected the blocks border displayed is barely visible on the blue background.
Therefore, where can the colour of the show blocks border be changed to a darker colour?
Unfortunately, color of border displayed for blocks isn’t customizable. CSS that styles them is generated by JS. You can find it here http://dev.ckeditor.com/browser/CKEditor/trunk/_source/plugins/showblocks/plugin.js#L28
I guess that you’re using compiled version of CKEditor, so source is minified. You’ll have to open
ckeditor.jsfile and find this fragment and change it manually.Or you can try to clone CKEditor 4 (new version that will be release next Tuesday), change this value here https://github.com/ckeditor/ckeditor-dev/blob/master/plugins/showblocks/plugin.js#L48 and then compile your build of CKEditor (you can find instructions here https://github.com/ckeditor/ckeditor-dev). But to do this you’d need Mac or Linux, because build script is written in Bash.