I faced with a black background problem as soon as I call WYSIWYG editor of Joomla. The whole background to type text is black and I can’t do anything with that.
So I surfed the google and found out the solutions.
I found some but here is the steps that works for me.
1. Download JCE WYSIWYG editor @ http://www.cellardoor.za.net/docman.html
2. You’ll have to download “JCE Core Component”
3. Upload with Filezilla to /my.colorfulparty.com/administrator/components/com_installer/module/
4. Install from Joomla Admin > Installers > Components
5. Download editor_content.css to you PC and upload with Filezilla to /my.colorfulparty.com/mambots/editors/jce/docs/
6. Go to Joomla Admin > Components > JCE Admin > JCE Configuration
7. On the Right Panel, change “Template CSS classes(‘No’)” and “Custom CSS Classes(‘editor_content.css’)”
8. Save it!!!
9. By the way, don’t forget to change TinyMCE to JCE Editor from Joomla Admin > Site > Global Configuration
10. Ok, hope everything is fine now and continue your pleasure time with Joomla 
Ps., if those 10 steps don’t work for you…..
1. Check “JCE Editor Mambot” is Published in “Mambot Manager”
2. If not, go to http://www.cellardoor.za.net/docman.html and download “JCE Core Mambot”.
3. Upload to /my.colorfulparty.com/administrator/components/com_installer/module/ and install and publish!