diff --git a/src/components/CourseView.tsx b/src/components/CourseView.tsx
index 0646bc81f..8a4027c38 100644
--- a/src/components/CourseView.tsx
+++ b/src/components/CourseView.tsx
@@ -40,7 +40,7 @@ export const CourseView = ({
 
 return (
 <div className="relative flex w-full flex-col gap-8 pb-16 pt-8 xl:pt-[9px]">
- <div className="sticky top-[73px] z-10 flex flex-col gap-4 bg-background py-2 xl:pt-2">
+ <div className="sticky top-[73px] z-20 flex flex-col gap-4 bg-background py-2 xl:pt-2">
 <breadcrumbcomponent
 course={course}
 contentType={contentType}
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://patch-diff.githubusercontent.com/raw/code100x/cms/pull/1863.diff">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://patch-diff.githubusercontent.com/raw/code100x/cms/pull/1863.diff" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast" selected="selected">配色反転</option>
<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>