diff --git a/css/default.css b/css/default.css
index ed7de8713..9c8e38266 100644
--- a/css/default.css
+++ b/css/default.css
@@ -110,7 +110,7 @@ a:active {color:#000;text-decoration:underline}
 #wrapper:after {display:block;visibility:hidden;clear:both;content:""}
 #wrapper_title {margin-bottom:20px;font-size:1.2em}
 
-#side_nb {float:right;width:209px;border:1px solid #cfded8;background:#fff}
+#wrapper aside {float:right;width:209px;border:1px solid #cfded8;background:#fff}
 
 #container {z-index:4;position:relative;float:left;padding:25px 15px 15px;width:728px;min-height:500px;height:auto !important;height:500px;border:1px solid #cfded8;background:#fff;zoom:1}
 #container:after {display:block;visibility:hidden;clear:both;content:""}
diff --git a/head.php b/head.php
index 02ed55ba8..5a8094c32 100644
--- a/head.php
+++ b/head.php
@@ -155,10 +155,10 @@ if ($config['cf_include_head']) {
 <hr>
 
 <div id="wrapper">
-    <div id="side_nb">
+    <aside>
         <?=(G4_IS_MOBILE?outlogin('basic'):outlogin('basic')); // 외부 로그인 ?>
         <?=(G4_IS_MOBILE?poll('basic'):poll('basic')); // 설문조사 ?>
-    </div>
+    </aside>
     <div id="container">
         <? if ((!$bo_table || $w == 's' ) && !defined("_INDEX_")) {?><h1 id="wrapper_title"><?=$g4['title']?></h1><?}?>
         <div id="text_size">
diff --git a/mobile/head.php b/mobile/head.php
index 6d79e2ece..6f0d1d19b 100644
--- a/mobile/head.php
+++ b/mobile/head.php
@@ -94,9 +94,9 @@ include_once(G4_LIB_PATH.'/popular.lib.php');
 <hr>
 
 <div id="wrapper">
-    <div id="side_nb">
+    <aside>
         <?=(G4_IS_MOBILE?outlogin('basic'):outlogin('basic')); // 외부 로그인 ?>
-    </div>
+    </aside>
     <div id="container">
         <? if ((!$bo_table || $w == 's' ) && !defined("_INDEX_")) {?><h1 id="wrapper_title"><?=$g4['title']?></h1><?}?>
         <div id="text_size">