diff --git a/first.html b/first.html
index 3ecc256..693370f 100644
--- a/first.html
+++ b/first.html
@@ -25,9 +25,11 @@
 <p id="takara">GPS宝探しゲームで商店街を歩いてみよう</p>
 <p id="umap">お店マップで気になるお店を見つけよう</p>
 <br>
+<div class="idou">
 <button onclick="location.href='https://www.yatex.org/gitbucket/j2223-sakura/concentration/pages/shinkei1.html'">神経衰弱ゲーム</button>
 <button onclick="location.href='https://www.yatex.org/gitbucket/j2223-sakura/JAXAtools/pages/GPS/index.html'">GPS宝探しゲーム</button>
 <button onclick="location.href='https://www.yatex.org/gitbucket/j2223-sakura/2024a/pages/map.html'">お店マップ</button>
+</div>
 
 
 <script>