In Moodle site administrators set a theme to change the look and feel of the site. Moodle 2.7 has two themes (Clean and More), both of which are responsive. Moodlerooms also has a responsive theme called Snap.
Certificates are commonly awarded in courses as a way to show that a student has accomplished a specified level of achievement. In the online world, students can receive a certificate virtually just as they might in the face-to-face setting.