Firefox client + dark theme: Huge white box covering chat

[mbr0wn]

Steps to reproduce

The Problem

When I use dark mode in Firefox, a huge white box covers the most recent chats and the chat entry:

This does not happen with light mode:

It also doesn't happen in Chrome.

Outcome

What did you expect?

No white box in dark mode

What happened instead?

A big white box in dark mode

Operating system

Windows + Linux (Ubuntu & Fedora), others untested

Browser information

Firefox 102, does not happen on Chrome

URL for webapp

https://chat.gnuradio.org

Application version

Element version: 1.11.0 Olm version: 3.2.8

Homeserver

gnuradio.ems.host

Will you send logs?

Yes

[turt2live]

This feels like it might be Windows interacting badly with Firefox

[mbr0wn]

This feels like it might be Windows interacting badly with Firefox

Note I saw this on Ubuntu and Fedora, too.