Firefox でボタンが中央揃えにならない問題を修正

Author: mucho613

_includes/top/sections/outline.html

@@ -37,6 +37,6 @@ <h2 id="outline" class="text-4xl text-center mb-8 pt-28 -mt-8">
   </div>
 </div>
 
-<div class="place-self-center mx-4 mt-16 lg:mx-8 sm:w-96">
+<div class="mx-auto mt-16 w-full sm:w-96 px-6">
   {% include button.html href="/outline" label="開催概要を詳しく見る" %}
 </div>