diff --git a/core/modules/system/css/system.module.css b/core/modules/system/css/system.module.css
index d5df86f..ac1fa33 100644
--- a/core/modules/system/css/system.module.css
+++ b/core/modules/system/css/system.module.css
@@ -194,7 +194,6 @@
   max-width: 100%;
   min-width: 100px;
   height: 16px;
-  background-color: #fff;
 }
 .progress__bar {
   background-color: #000;