Right now, the logo for the [GitHub @wikimedia account](https://github.com/wikimedia) badly contrasts with the dark background (avatar background is #26292f), and only appears properly on a white background. This is mainly due to the transparency that was not removed on upload.
Since the dark background is widely used on GitHub, it's probably worth adding in a white background to the image to always ensure that it's on a white background, instead of relying on the page's CSS setting the background to white (which is only the case when light mode is used). I'm suggesting a white background since [foundation:Legal:Visual identity guidelines#18](https://foundation.wikimedia.org/wiki/Legal:Visual_identity_guidelines#18) (and a few other parts of that page) implies that the mark must only be on white backgrounds.
I've attached a possible replacement avatar below. The mark currently appears smaller than what the GitHub organization avatar currently has, as I padded the logo with more space to comply with the clear space requirement in [foundation:Legal:Visual identity guidelines#16](https://foundation.wikimedia.org/wiki/Legal:Visual_identity_guidelines#16).
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