Minor quiz layout improvements. Merged from MOODLE_19_STABLE.

mod/quiz/attempt.php

@@ -414,7 +414,9 @@
         unset($buttonoptions);
         $buttonoptions['q'] = $quiz->id;
         $buttonoptions['forcenew'] = true;
+        echo '<div class="controls">';
         print_single_button($CFG->wwwroot.'/mod/quiz/attempt.php', $buttonoptions, get_string('startagain', 'quiz'));
+        echo '</div>';
     /// Notices about restrictions that would affect students.
         if ($quiz->popup) {
             notify(get_string('popupnotice', 'quiz'));

theme/standard/styles_layout.css

@@ -3737,9 +3737,10 @@ body#question-preview .quemodname, body#question-preview .controls {
   text-align: center;
 }
 
+#mod-quiz-attempt #page .controls,
 #mod-quiz-review #page .controls {
   text-align: center;
-  margin: 1.5em auto;
+  margin: 8px auto;
 }
 #mod-quiz-review .pagingbar {
   margin: 1.5em auto;