Issue #2315019 by gauravkhambhala, sam152 | alexpott: Fixed Duplicate css in system.module.css.

core/modules/system/css/system.module.css

@@ -194,7 +194,6 @@ table.sticky-header {
   max-width: 100%;
   min-width: 100px;
   height: 16px;
-  background-color: #fff;
 }
 .progress__bar {
   background-color: #000;