CSS table and select default
 Changes to be committed:
	modified:   school-dao/src/main/java/school/dao/implementation/GroupDaoImpl.java
	modified:   school-service/src/main/java/school/service/implementation/GroupServiceImpl.java
	modified:   school-web/src/main/java/school/controller/GroupController.java
	modified:   school-web/src/main/webapp/resources/css/course.css
	modified:   school-web/src/main/webapp/resources/css/group-edit.css
	modified:   school-web/src/main/webapp/resources/css/group.css
	modified:   school-web/src/main/webapp/resources/css/main.css
	modified:   school-web/src/main/webapp/views/groups/head-teacher-edit.jsp
	modified:   school-web/src/main/webapp/views/groups/head-teacher.jsp
	modified:   school-web/src/main/webapp/views/groups/teacher.jsp