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Hi @johndoe1 and @StylishThemes,
I have just looked the issue, and I just realized something. The background-color of wikipedia is always blank. So, when an image is a little transparent, we can assume that the image should be visible in white.
I think it's more important, in some cases, to just display the information and fall back to a default solution.
Here is my solution (and it doesn't break the css style for the math images):
Sorry for taking so long... I was on vacation! I've added a background color of #ddd so that it isn't so bright. Thanks again for the suggestion!