The backgorund colour is more selectively applied
elsewhere. This just causes problems if the skin
sets <textarea>s to transparent (e.g. Minerva).
Change-Id: I6695dc5af9224238efdc3eac97817010cf52237d
* This patch convert .css to .less
* Semantic changes are avoided, but there are minor
tweaks such as capitalization and ordering.
Change-Id: Iebff0f8e3d87bb792093a10d87f33540aca301d5