diff --git a/app/views/admin/journal_papers/index.html.erb b/app/views/admin/journal_papers/index.html.erb
index 12cba11..612a6ef 100644
--- a/app/views/admin/journal_papers/index.html.erb
+++ b/app/views/admin/journal_papers/index.html.erb
@@ -15,7 +15,7 @@
 <div class="bottomnav clearfix">
 	<div class="action pull-right">
 		<div class="dropup upload-button">
-		    <button type="button" onclick="location.href=location.href+'merge'">
+		    <button class="btn btn-primary" type="button" onclick="location.href=location.href+'merge'">
     			<i class="far fa-object-group"></i>
     			<span class="group"></span>合併
     		</button>