MDL-63042 core_theme: Change the background color

theme/boost/scss/moodle.scss

@@ -16,6 +16,7 @@ $breadcrumb-divider-rtl: "◀" !default;
 @import "moodle/calendar";
 @import "moodle/course";
 @import "moodle/drawer";
+@import "moodle/dashboard";
 @import "moodle/filemanager";
 @import "moodle/message";
 @import "moodle/question";

theme/boost/scss/moodle/dashboard.scss

@@ -0,0 +1,4 @@
+// Background color change as of MDL-63042
+#page-my-index {
+    background-color: $gray-100;
+}

theme/boost/style/moodle.css

@@ -12620,6 +12620,9 @@ body.drawer-ease {
   body.drawer-open-right {
     margin-right: 285px; } }
 
+#page-my-index {
+  background-color: #f8f9fa; }
+
 .fp-content-center {
   height: 100%;
   width: 100%;