diff --git a/src/css/core/utils/common.css b/src/css/core/utils/common.css
index 238f4474b1..7576996e65 100644
--- a/src/css/core/utils/common.css
+++ b/src/css/core/utils/common.css
@@ -49,7 +49,7 @@
   color: #3d4d66;
 }
 .bi-theme-dark .bi-background {
-  background-color: #191B2B;
+  background-color: #191b2b;
   color: #cccccc;
 }
 .bi-theme-dark .bi-background .bi-input {