Add new button to share on Facebook in Exhibition

Author: yasulab

tasks/upsert_project_pages_by_data.rb

@@ -53,14 +53,18 @@
     </div>
 
     <div>
-      <a href="#{project[:url]}" target="_blank" rel="noopener" class="button" style="margin-bottom: 50px;">
+      <a href="#{project[:url]}" target="_blank" rel="noopener" class="button">
         <i class="fas fa-scroll"></i>
         作品を見る
       </a>
-      <a href="https://twitter.com/intent/tweet?text={{ page.title | replace: '&', '%26' }}+%7C+ニンジャ大博覧会&hashtags=DojoConJapan,CoderDojo&url={{ site.url }}/expo/#{project[:id]}&lang=jp&related=DojoConJapan" target="_blank" rel="noopener" class="button">
+      <a href="https://twitter.com/intent/tweet?text={{ page.title | replace: '&', '%26' }}+%7C+ニンジャ大博覧会&hashtags=DojoConJapan,CoderDojo&url={{ site.url }}/expo/#{project[:id]}&lang=jp&related=DojoConJapan" target="_blank" rel="noopener" class="button" style="margin: 50px auto;">
         <i class="fab fa-twitter"></i>
         作品を共有する
       </a>
+      <a href="https://www.facebook.com/share.php?u={{ site.url }}/expo/#{project[:id]}" target="_blank" rel="noopener" class="button">
+        <i class="fab fa-facebook"></i>
+        作品を共有する
+      </a>
     </div>
 
     <div class="content main_content">