diff --git a/ui/src/components/tab/style.css b/ui/src/components/tab/style.css
index 6a70a80b..a699a6b7 100644
--- a/ui/src/components/tab/style.css
+++ b/ui/src/components/tab/style.css
@@ -20,9 +20,8 @@
     clip: rect(0 0 0 0);
     height: 1px;
     opacity: 0;
-    position: fixed;
     width: 1px;
-    @add-mixin move-z -1;
+    @add-mixin move-z -1, fixed;
   }
 
   & .panel {
diff --git a/ui/src/util/mixins.css b/ui/src/util/mixins.css
index 6c63fd38..51bcb34d 100644
--- a/ui/src/util/mixins.css
+++ b/ui/src/util/mixins.css
@@ -17,7 +17,7 @@
   }
 }
 
-@define-mixin move-z $amount:0 {
-  position: relative;
+@define-mixin move-z $amount:0, $position:relative {
+  position: $position;
   z-index: $amount;
 }