diff --git a/app/assets/stylesheets/common/components/dropdown-select-box.scss b/app/assets/stylesheets/common/components/dropdown-select-box.scss
index 5e751c8b597..dc91d643671 100644
--- a/app/assets/stylesheets/common/components/dropdown-select-box.scss
+++ b/app/assets/stylesheets/common/components/dropdown-select-box.scss
@@ -4,8 +4,6 @@
   min-width: auto;
 
   &.is-expanded {
-    z-index: 9999;
-
     .collection,
     .select-box-collection,
     .select-box-body {
diff --git a/app/assets/stylesheets/common/components/select-box.scss b/app/assets/stylesheets/common/components/select-box.scss
index 49404876eb8..f8cfce949ed 100644
--- a/app/assets/stylesheets/common/components/select-box.scss
+++ b/app/assets/stylesheets/common/components/select-box.scss
@@ -16,7 +16,7 @@
   }
 
   &.is-expanded {
-    z-index: 9999;
+    z-index: 999;
 
     .select-box-wrapper {
       border: 1px solid $tertiary;