For this test please install a third party activity type plugin to check the icon styling of non-core activities. The subcourse activity is nice to test with: https://moodle.org/plugins/mod_subcourse Test the activity icons on the course page Login as admin Restore the attached course backup as a new course Verify the course activities have the icons as shown in the attachements on this issue (except the resource type) Verify the colours used for the activities match the icon colours as shown on the attachment expected look: Test the activity icons on the gradebook Enrol a test user on the restored course Navigate to the course gradebook Verify you see the new activity icons without any background in black expected result: Test the activity icons in the activity chooser. On the course turn editing on Click the 'add an activity or resource' link Verify you see the new activity icons with the background colours Verify you see the subcourse plugin with the standard icon and a dark gray background expected result: Test the activity icons in the main menu block Add the main menu block to the site homepage Click the "add an activity or resource" link Add an assignment a resource activity and the subcourse activity Verify you see the activity in the block similar to the image below expected result: