Which vignette are you talking about? If you mean the hover effect, I see white text on black right now. Do you want this to change? Please let me know where/what you want to change. Any URL will be helpful as well.
The first image, when you are on the main page, yes the hover effect. When I hover the vignette turns black and the white text is clearly readable. before I hover the text is pure white, and I want to change that font colour to a grey colour.