added the class names for the css styling related fix

edx_proctoring/templates/proctoring/seq_timed_exam_completed.html

 {% load i18n %}
-<div class="sequence" >
+<div class="sequence timed-exam completed">
     <div class="gated-sequence">
         {% trans "All done!" %}
     </div>

edx_proctoring/templates/proctoring/seq_timed_exam_entrance.html

 {% load i18n %}
-<div class="sequence" data-exam-id="{{exam_id}}">
+<div class="sequence timed-exam entrance" data-exam-id="{{exam_id}}">
   <h3>
     {% blocktrans %}
     {{ display_name }} is a Timed Exam ({{total_time}})

edx_proctoring/templates/proctoring/seq_timed_exam_expired.html

 {% load i18n %}
-<div class="sequence">
+<div class="sequence timed-exam expired">
     <div class="gated-sequence">
         {% trans "You have run out of time!" %}
     </div>