Very simple way to fix dark mode equation display problem. Literally 10 character fix included.
If you are using the dark mode setting with wikiwand pages that contain complex mathematical portions become impossible to see because they are rendered in black against the black background. This is super annoying and after getting tired of having to work around this I realized a code addition of just 10 characters will fix this issue.
The problem arises because wikipedia renders complex math written in latex as SVG objects on the page. Wikiwand does nothing to these images, leaving them impossible to see.
The fix is to add filter:invert(90%) to the img style tag. That's all. It's that easy. With this tweak the math becomes nearly, but not purely, white; allowing it to be easily read and recognized.
Obviously you do not want to apply this filter to normal images and this is made very easy as well because math displayed on wikipedia is always contained within span of class "mwe-math-element" making this fix both easy to do and easy to pinpoint its effect.
Thanks,

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bob week commented
this issue persists. see the multivariate normal page for example. following the suggestion made by Eldoprano fixes the issue.
https://www.wikiwand.com/en/Multivariate_normal_distribution
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Eldoprano commented
For the ones having this problem, you can download the extension "Stylus" and add this fow wikiwand:
.equation-box {
background-color:#00000000 !important;
border-color: #424242f0 !important;
border-radius: 1em !important;
}For the developers:
... Please fix this problem.. Here an example of an article's equation being massacred by this error:
https://www.wikiwand.com/en/Entropy_(information_theory) -
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刘京玮 commented
body.dark img.mwe-math-fallback-image-inline {filter: invert(1);
that's my way. -
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