diff --git a/_includes/style.scss b/_includes/style.scss
index 119108d..28ed18c 100644
--- a/_includes/style.scss
+++ b/_includes/style.scss
@@ -26,7 +26,7 @@ $container-box-shadow: 0 0 10px 0 #ddd;
 // ヘッダ
 $header-background:              #eee;
 $header-link-color:              #694;
-$header-mobile-box-shadow:       0 0 5px 2px rgba(0,0,0,0.1);
+$header-mobile-box-shadow:       0 0 5px 2px rgba(0,0,0,0.3);
 $header-img-vertical-adjustment: -.4em;
 
 // 本文 (左メニュー含む)