Code blocks show different grey levels

[ctron]

Using code blocks show different level of gray for the block background and the line background:

I think this is due to fact that <pre> and <code> use different ways to color the background and the resulting RGB values don't match.

Probably the most simple solution would be to remove the background color of <code> elements if they are contained in a <pre> element.

[hellt]

this is really annoying =)