Expand sidepanel "lip" is not darkened when in dark mode

[ShadowJonathan]

Steps to reproduce

(Design issue)

Outcome

What did you expect?

A similarly-themed button.

What happened instead?

Operating system

Linux

Browser information

Brave (Version 1.26.67 Chromium: 91.0.4472.114)

URL for webapp

develop.element.io

Application version

Element version: b0abbfa-react-b4b81a455e14-js-39a8399977af Olm version: 3.2.3

Homeserver

matrix.org

Will you send logs?

No

[ShadowJonathan]

cc @t3chguy & #17993

[t3chguy]

It is meant to be inverted by design. In light theme it is very dark.
This is so it is visible even against the filter field

[ShadowJonathan]

It's extremely contrasting and does definitely stick out, but in a "this looks like a theming fault", this feels like I'd see on a website with wonky CSS, thus this issue.

If it's meant to be contrasting, a slightly brighter or only slightly darker colour would've done the trick, this is overkill, and doesn't feel right in the rest of the design.

[t3chguy]

Yup, I agree, hence me passing it onto Design rather than closing it