Issue 5941 - Implemented background-color utility classes

static/scss/_utilities.scss

 // This file is part of website-defaults
 // Copyright (C) 2016-present eyeo GmbH
 //
 // website-defaults is free software: you can redistribute it and/or
 // modify it under the terms of the GNU General Public License as published by
 // the Free Software Foundation, either version 3 of the License, or
 // (at your option) any later version.
 //
 // website-defaults is distributed in the hope that it will be useful,
 // but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 48 matching lines @@
 .clearfix:before
 {
   display: table;
   content: " ";
 }
 
 .clearfix:after
 {
   clear: both;
 }
+
+/* Backgrounds
+ ******************************************************************************/
+
+.bg-primary
+{
+  color: $primary-light;
+  background-color: $primary-dark;
+}
+
+.bg-secondary
+{
+  color: $secondary-light;
+  background-color: $secondary-dark;
+}
+
+.bg-accent
+{
+  color: $accent-light;
+  background-color: $accent-dark;
+}
+
+.bg-error
+{
+  color: $error-light;
+  background-color: $error-dark;
+}