Fix missing background behind dismissable banner in web UI (#27479)

app/javascript/mastodon/features/explore/statuses.jsx

@@ -45,24 +45,20 @@ class Statuses extends PureComponent {
     const emptyMessage = <FormattedMessage id='empty_column.explore_statuses' defaultMessage='Nothing is trending right now. Check back later!' />;
 
     return (
-      <>
-        <DismissableBanner id='explore/statuses'>
-          <FormattedMessage id='dismissable_banner.explore_statuses' defaultMessage='These are posts from across the social web that are gaining traction today. Newer posts with more boosts and favorites are ranked higher.' />
-        </DismissableBanner>
-
-        <StatusList
-          trackScroll
-          timelineId='explore'
-          statusIds={statusIds}
-          scrollKey='explore-statuses'
-          hasMore={hasMore}
-          isLoading={isLoading}
-          onLoadMore={this.handleLoadMore}
-          emptyMessage={emptyMessage}
-          bindToDocument={!multiColumn}
-          withCounters
-        />
-      </>
+      <StatusList
+        trackScroll
+        prepend={<DismissableBanner id='explore/statuses'><FormattedMessage id='dismissable_banner.explore_statuses' defaultMessage='These are posts from across the social web that are gaining traction today. Newer posts with more boosts and favorites are ranked higher.' /></DismissableBanner>}
+        alwaysPrepend
+        timelineId='explore'
+        statusIds={statusIds}
+        scrollKey='explore-statuses'
+        hasMore={hasMore}
+        isLoading={isLoading}
+        onLoadMore={this.handleLoadMore}
+        emptyMessage={emptyMessage}
+        bindToDocument={!multiColumn}
+        withCounters
+      />
     );
   }