[Bug] Buttons do not change color on hover

[schlagmichdoch]

This issue was deleted by GitHub (via hubot) as part of mistakenly marking this account as spam on 17th February 2024. The creation date is unclear. There are also links to the deleted issue that are not updated to this issue. I decided to manually recreate it anyway in order to complete the information the repo holds even though the restored information might be outdated:

Issue by @schlagmichdoch:

Describe the bug
Buttons should change on hover, but they do not

Screenshots
https://imgur.com/a/tA6x1oz

Bug occurs on official PairDrop instance https://pairdrop.net/
Yes
Version: v1.10.6

Bug occurs on self-hosted PairDrop instance
Yes

Solution
Opacity changes in background for icon-buttons but in foreground for all other buttons

.icon-button::before {
    z-index: -1;
}

.btn::before {
    z-index: 0; /*default*/
}