Button Stylesheet Broken in Dark Mode Themes

[DaltJM]

Describe the bug Since updating to Mattermost version 8.1, the gif picker buttons stylesheet isn't displaying correctly. When not hovered the button is white and when hovered turns dark.

To Reproduce Steps to reproduce the behavior:

1. Upgrade Mattermost to 8.1 ESR
2. Type /gif text
3. Press enter
4. Observe wrong coloured buttons in dark themes

Expected behavior The buttons to be visible and the correct colour.

Screenshots

Mattermost information

• server version: 8.1
• client version: Browser
• plugin version: 2.1
• add any relevant server logs (after removing any private data from the logs, such as your IP). They can be found in the Admin console > No errors in logs

[moussetc]

Ho @DaltJM , thank you for bringing this issue to my attention. I am currently not able to work on the issue, jut I have asked about it in the Mattermost official instance because I suspect an issue on their side (this plugin relies fully on Mattermost for the UI, there is no custom theming).

[moussetc]

Looks like it is a Mattermost issue: https://github.com/mattermost/mattermost/issues/23968

I'm keeping this issue open until I'm sure that the Mattermost fix is enough and that there are no additional work to do on the plugin itself.