diff --git a/mobile/skin/member/basic/register_form.skin.php b/mobile/skin/member/basic/register_form.skin.php
index fc323c6f9..904463edf 100644
--- a/mobile/skin/member/basic/register_form.skin.php
+++ b/mobile/skin/member/basic/register_form.skin.php
@@ -53,7 +53,7 @@ if ($config['cf_cert_use'] && ($config['cf_cert_sa'] || $config['cf_cert_ipin']
                 <?php }
 	            if ($config['cf_cert_use']) {
                     if($config['cf_cert_sa']) {
-                        echo '<button type="button" id="win_sa_kakao_cert" class="btn_frmline win_sa_cert" data-type="">통합 인증</button>'.PHP_EOL;
+                        echo '<button type="button" id="win_sa_kakao_cert" class="btn_frmline btn win_sa_cert" data-type="">통합 인증</button>'.PHP_EOL;
                     }
                     if($config['cf_cert_hp'])
                         echo '<button type="button" id="win_hp_cert" class="btn_frmline btn">휴대폰 본인확인</button>'.PHP_EOL;
diff --git a/mobile/skin/social/social_register_member.skin.php b/mobile/skin/social/social_register_member.skin.php
index 1039afcf5..d8dcffff0 100644
--- a/mobile/skin/social/social_register_member.skin.php
+++ b/mobile/skin/social/social_register_member.skin.php
@@ -109,7 +109,7 @@ $email_msg = $is_exists_email ? '등록할 이메일이 중복되었습니다.
                     <?php }
                     if ($config['cf_cert_use']) {
                         if ($config['cf_cert_sa']) {
-                            echo '<button type="button" id="win_sa_kakao_cert" class="btn_frmline win_sa_cert" data-type="">통합 인증</button>'.PHP_EOL;
+                            echo '<button type="button" id="win_sa_kakao_cert" class="btn_frmline btn win_sa_cert" data-type="">통합 인증</button>'.PHP_EOL;
                         }
                         if ($config['cf_cert_hp'])
                             echo '<button type="button" id="win_hp_cert" class="btn_frmline btn">휴대폰 본인확인</button>' . PHP_EOL;
diff --git a/theme/basic/mobile/skin/member/basic/register_form.skin.php b/theme/basic/mobile/skin/member/basic/register_form.skin.php
index f0d1846bc..1a5e3103c 100644
--- a/theme/basic/mobile/skin/member/basic/register_form.skin.php
+++ b/theme/basic/mobile/skin/member/basic/register_form.skin.php
@@ -53,7 +53,7 @@ if ($config['cf_cert_use'] && ($config['cf_cert_sa'] || $config['cf_cert_ipin']
                     <?php }
 	            if ($config['cf_cert_use']) {
                     if ($config['cf_cert_sa']) {
-                        echo '<button type="button" id="win_sa_kakao_cert" class="btn_frmline win_sa_cert" data-type="">통합 인증</button>'.PHP_EOL;
+                        echo '<button type="button" id="win_sa_kakao_cert" class="btn_frmline btn win_sa_cert" data-type="">통합 인증</button>'.PHP_EOL;
                     }
                     if ($config['cf_cert_hp'])
                         echo '<button type="button" id="win_hp_cert" class="btn_frmline btn">휴대폰 본인확인</button>'.PHP_EOL;