Color for h_cdata in code.css is unreadable

[Tim Hatch <trac@…>]

The declaration for  .h_cdata gives a very bright yellow, which is unreadable on the white background provided, and even worse on light gray like it's rendering in this ticket.

 Automated color checkers show this as not contrasting nearly enough to be readable.

I cannot suggest a better color, though I've been using green with acceptable results and it's not used much.

Demo data:

<![CDATA[
This is a test.
]]>

[cboos]

Fixed in r3134, thanks!