Background Colour varies behind the logo

Background Colour varies behind the logo

Previously, I uploaded a PNG logo with a transparent background and it worked great. With a recent update the banner background colour changed to a dark grey and my logo looks like rubbish. I would update my logo to work with the darker background but the logon page will has a light background - I don't have a logo that will work in both situations.

This is from our logon page:

And this is the same logo after logging in:

I'd like to see the banner background colour consistent - and ideally customisable.

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