diff --git a/framework/core/ember/app/styles/flarum/modals.less b/framework/core/ember/app/styles/flarum/modals.less
index f3695ff4c..1ff03b97d 100644
--- a/framework/core/ember/app/styles/flarum/modals.less
+++ b/framework/core/ember/app/styles/flarum/modals.less
@@ -2,7 +2,7 @@
 // Modals
 
 .modal-backdrop {
-  background-color: @fl-primary-color;
+  background-color: @fl-body-primary-color;
   &.in {
     opacity: 0.9;
   }
@@ -36,7 +36,7 @@
   }
 }
 .modal-body {
-  background-color: @fl-secondary-color;
+  background-color: @fl-body-secondary-color;
   padding: 25px;
 
   & .form-control {