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On the Stack Overflow, it's easy to realize the questions with favourite tags:
But on the SF, the background is quite light:
What do you think?
The design team will eventually get round to looking at this I'm sure. Whilst waiting perhaps you'd like to have a go at factoring this number which may turn out to take less time.
Alternatively you can use stylish in FF or Chrome and tweak the colour scheme yourself.
I don't see the problem. Maybe you need to adjust your monitor. While the contrast isn't as great as that on SO it's still more than adequate to make it obvious.