**Steps to replicate the issue** (include links if applicable):
* The set up: mobile version, dark theme enabled, narrow screen (smartphone like)
* open up any diff, for example: https://pl.m.wikipedia.org/w/index.php?title=Divock_Origi&diff=prev&oldid=74395337
* scroll down to the bottom, to the footer
**What happens?**:
It might not be very visible, but the "Wikipedia" image is stacked on top of the white-ish box with the info about the diff.
{F56654615}
To make it more visible, I changed the color of the element with a class `.mw-diff-ntitle2` to red:
{F56654627}
**What should have happened instead?**:
The "Wikipedia" image should "hide"/"slide" under the box like in the day mode.
Also (but it should be probably an another ticket), the box with the diff info should be dark, since it is a dark mode
**Software version** (on `Special:Version` page; skip for WMF-hosted wikis like Wikipedia):
**Other information** (browser name/version, screenshots, etc.):
Appears on Firefox, Edge, Firefox mobile, haven't tested other browsers.
The image in the footer is this one: https://pl.m.wikipedia.org/static/images/mobile/copyright/wikipedia-wordmark-en.svg
There's no other version of the image for the night mode, it has the colors inverted by (I suppose) this function: https://gerrit.wikimedia.org/g/mediawiki/skins/MinervaNeue/+/90fe9441f24e176400a49828f2632dfe562becdf/minerva.less/minerva.mixins.less#88
It seems like inverting the colors messes up with the stacking (the issue doesn't appear in the light mode). Might be relevant: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_positioned_layout/Understanding_z-index/Stacking_context