diff --git a/app/assets/stylesheets/common/main_layout.css.scss b/app/assets/stylesheets/common/main_layout.css.scss
index 6afab1f06..c11b0eabc 100644
--- a/app/assets/stylesheets/common/main_layout.css.scss
+++ b/app/assets/stylesheets/common/main_layout.css.scss
@@ -27,7 +27,6 @@ div#page {
   aside#sidebar {
     width: 15em;
     float: left;
-    position: absolute;
     
     h1 {
       font-size: $h3_size;
@@ -41,6 +40,11 @@ div#page {
       width: 10em;
     }
   }
+  
+  aside#sidebar:after {
+    content: "";
+    clear: both;
+  }
 
   aside#sidebar > section {
     margin-bottom: 1em;
diff --git a/app/assets/stylesheets/specific/posts.css.scss b/app/assets/stylesheets/specific/posts.css.scss
index ba9181143..ec6ad27b3 100644
--- a/app/assets/stylesheets/specific/posts.css.scss
+++ b/app/assets/stylesheets/specific/posts.css.scss
@@ -176,10 +176,13 @@ div#c-posts {
   
   div#a-index {
     div#posts {
-      margin-left: 15em;
       margin-right: 6.5em;
     }
     
+    #content {
+      margin-left: 15em;
+    }
+    
     div#jlist-rss-ads-for-show {
       float: right;
       position: absolute;