diff --git a/src/app/shared/components/signin-modal/signin-modal.component.scss b/src/app/shared/components/signin-modal/signin-modal.component.scss
index b65234fb3d7035bd0a406e3d617d3d3a3bd107e9..921ab238f53e4c2901625bb28b95c03bc570fa17 100644
--- a/src/app/shared/components/signin-modal/signin-modal.component.scss
+++ b/src/app/shared/components/signin-modal/signin-modal.component.scss
@@ -5,7 +5,7 @@
 @import '../../../../assets/scss/hyperlink';
 .cModal {
   position: fixed;
-  z-index: $modal-add-structure-z-index;
+  z-index: $modal-authent-z-index;
   top: 0;
   right: 0;
   bottom: 0;
diff --git a/src/app/shared/components/signup-modal/signup-modal.component.scss b/src/app/shared/components/signup-modal/signup-modal.component.scss
index b65234fb3d7035bd0a406e3d617d3d3a3bd107e9..921ab238f53e4c2901625bb28b95c03bc570fa17 100644
--- a/src/app/shared/components/signup-modal/signup-modal.component.scss
+++ b/src/app/shared/components/signup-modal/signup-modal.component.scss
@@ -5,7 +5,7 @@
 @import '../../../../assets/scss/hyperlink';
 .cModal {
   position: fixed;
-  z-index: $modal-add-structure-z-index;
+  z-index: $modal-authent-z-index;
   top: 0;
   right: 0;
   bottom: 0;
diff --git a/src/assets/scss/_z-index.scss b/src/assets/scss/_z-index.scss
index 1f6dbcd22289984b44529458df1b94e40d7cfb2d..e5ce1fa87779d4aef70b3b33a21a911ef8f65f43 100644
--- a/src/assets/scss/_z-index.scss
+++ b/src/assets/scss/_z-index.scss
@@ -3,3 +3,4 @@ $modal-add-structure-z-index: 1002;
 $modal-filter-structure-z-index: 1002;
 $modal-menu-phone-z-index: 1002;
 $btn-phone-switch-map-list-z-index: 1001;
+$modal-authent-z-index: 1003;