--- C:/Users/rleung/Documents/Local Moodle/moodle/mod/scorm/player.php	Mon Mar 23 15:34:51 2015
+++ C:/Users/rleung/Documents/Local Moodle/MoodleWindowsInstaller-latest-28/server/moodle/mod/scorm/player.php	Tue Jul 14 10:20:58 2015
@@ -155,7 +155,12 @@
 
 // Print the page header.
 if (empty($scorm->popup) || $displaymode == 'popup') {
-    $exitlink = html_writer::link($CFG->wwwroot.'/course/view.php?id='.$scorm->course, $strexit, array('title' => $strexit));
+
+    $url = $CFG->wwwroot. '/course/view.php?id='. $scorm->course;
+    $button = 'btn btn-danger';
+    $exitlink = html_writer::link($url,
+                             $strexit,
+                             array('title' => $strexit, 'class' => $button));
     $PAGE->set_button($exitlink);
 }