Ryan Boren 08ad57c8e4 Customizer UI tweaks.
* Don't flip arrow when for open section.
* Give the open section a white background.
* Provide a darker hover state for section headers.

Props helenyhou, SergeyBiryukov
fixes #20828


git-svn-id: https://develop.svn.wordpress.org/trunk@20991 602fd350-edb4-49c9-b593-d223f7449a82
2012-06-04 17:02:56 +00:00
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