Small CSS module. There was a ordering conflict between `.ui.menu` and
`.ui.container` which I've solved by adding the `.ui.menu` rule into
base.
Co-authored-by: Giteabot <teabot@gitea.io>
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Conflict resolution: None
Ref: https://codeberg.org/forgejo/forgejo/issues/2776
(cherry picked from commit 2d281704de8c5b67592dd7f9362620927230ef2b)
