diff --git a/UI/WebServerResources/scss/core/variables.scss b/UI/WebServerResources/scss/core/variables.scss
index 9c5463f8e..325ae3684 100644
--- a/UI/WebServerResources/scss/core/variables.scss
+++ b/UI/WebServerResources/scss/core/variables.scss
@@ -140,6 +140,7 @@ $whiteframe-zindex-z5: 5 !default;
 
 $z-index-tooltip: 100 !default;
 $z-index-menu: 99 !default;
+$z-index-select: 99 !default;
 $z-index-dialog: 80 !default;
 $z-index-toast: 90 !default;
 $z-index-bottom-sheet: 70 !default;