diff --git a/src/components/DropDownBox/DropDownBox.scss b/src/components/DropDownBox/DropDownBox.scss
index 437c037..ff74c3a 100644
--- a/src/components/DropDownBox/DropDownBox.scss
+++ b/src/components/DropDownBox/DropDownBox.scss
@@ -6,7 +6,7 @@
   position: absolute;
   left: 0;
   top: 30px;
-  z-index: 10;
+  z-index: 20;
 
   &,
   & a {
diff --git a/src/components/Header/Header.scss b/src/components/Header/Header.scss
index f8c660a..2081d4a 100644
--- a/src/components/Header/Header.scss
+++ b/src/components/Header/Header.scss
@@ -10,6 +10,7 @@
   @media screen and (min-width: 600px) {
     position: sticky;
     top: 0;
+    z-index: 10;
   }
 
   @media screen and (max-width: 600px - 1px) {