diff --git a/javascripts/discourse/components/toc-timeline.gjs b/javascripts/discourse/components/toc-timeline.gjs
index 31d2006..8dd36b9 100644
--- a/javascripts/discourse/components/toc-timeline.gjs
+++ b/javascripts/discourse/components/toc-timeline.gjs
@@ -64,6 +64,7 @@ export default class TocTimeline extends Component {
       {{didUpdate this.handleTimelineUpdate @renderTimeline}}
       class="d-toc-main"
     >
+      {{bodyClass "d-toc-installed"}}
       {{#if this.shouldRenderToc}}
         {{#unless this.isTopicProgress}}
           {{bodyClass "d-toc-active"}}