### Summary The sidebar has lost its definition in Dark mode. ### Steps to reproduce 1. Turn on Dark mode 2. Don't turn off the new sidebar 3. Look at the sidebar. ### Example Project This happens on GitLab.com ### What is the current *bug* behavior? The Sidebar renders all in the same flat gray. ### What is the expected *correct* behavior? The correct colors are used. ### Relevant logs and/or screenshots | Before | Current (regresion) | | ------ | ------ | |  |  | ### Possible fixes This regression was caused by https://gitlab.com/gitlab-org/gitlab/-/merge_requests/124939! so there's likely parts of that that need to be reverted/updated. Slack Thread: https://gitlab.slack.com/archives/CETG54GQ0/p1688130203228499