Improve appearance of the messaging app on the index.php page

Login as Admin Create 3 new users: s1, s2, s3 Create a new course: c1 Enrol s1, s2 and s3 to the course. In course c1 create a new group: g1, add s1, s2 and s3 to that group, and enable messaging for this group Login as user s1 Navigate to message/index.php Verify you see the messaging interface in a 2 pane layout Verify you see group g1 in the group section Search for user s2 (by searching for her/his firstname and lastname, not username) Verify  the search results show in the left pane Send user s2 a message Verify  there is no back option in the right pane conversation header with user s2 Close the search Send a message to your group Verify  there is no back option in the group conversation header Click on the group name in the conversation header Verify you see the list of group members  and  there is a close button (a black cross) in the group members header Click on a group member Verify you see a conversation window with the group member Verify there is a close button in the conversation header Close the conversation Open the conversation with user s2 Click the 3-dot menu in the conversation header Try the info option and  verify  you can close the new opened (info) window.