diff --git a/_posts/fork/2026-06-24-ja-clean.md b/_posts/fork/2026-06-24-ja-clean.md
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--- a/_posts/fork/2026-06-24-ja-clean.md
+++ b/_posts/fork/2026-06-24-ja-clean.md
@@ -1,5 +1,5 @@
 ---
-layout: post
+layout: theme
 title: Ja-Clean
 description: 日本語ユーザーのためのスタイル。行間はせまめで大量の文章を１スクロールでよめる設計。
 repo: https://github.com/koacjp/typora-theme-ja-clean
diff --git a/media/thumbnails/ja-clean.png b/media/thumbnails/ja-clean.png
new file mode 100644
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