How do you change the visual editor’s background color?

I have a WordPress site in which the background color is black and the text is white. The site is fine, but it’s a pain trying to edit content in the visual editor as the background is white (same color as the text). I end up having to tell users to use the HTML view or write up the content in black color text and then at the end just select all the text and flip it to white (in which case many of them freak out and think their text is now deleted!)

Undefined property: stdClass::$labels in general-template.php post_type_archive_title()

I’ve got a custom post type with a standard tag taxonomy added to it like so: 'taxonomies' => array('post_tag'). I’ve added some tags to some posts of this CPT which are display on the front-end with the template tag the_tags() and the links it generates have this format http://local.mysite.dev/tag/tag1/. When I click such a link a page without any posts is generated using the tag.php template, but if I add ?post_type=seron_mycpt to the end of the URL like so http://local.mysite.dev/tag/tag1/?post_type=seron_mycpt a page with the relevant posts is generated using the same template but this time I also get these lines added to debug.log:

Autocomplete for taxonomy input boxes on a front end form

I have created a simple frontend form to allow users to submit posts – similar to the tutorial here – http://voodoopress.com/ . I also have a couple of custom taxonomies which i have as text input boxes on my form. This is all working but i was wondering if there is anyway i can have all the fields including Post Title and the taxonomies to auto suggest existing values?