diff --git a/app/assets/stylesheets/specific/posts.css.scss b/app/assets/stylesheets/specific/posts.css.scss
index 2d2364e48..8876aedb7 100644
--- a/app/assets/stylesheets/specific/posts.css.scss
+++ b/app/assets/stylesheets/specific/posts.css.scss
@@ -107,8 +107,8 @@ div#c-posts {
   
   div#a-index {
     div#posts {
+      max-width: 900px;
       float: left;
-      width: 90%;
     }
     
     div#jlist-rss-ads-for-show {