updates per UX review

edx_proctoring/templates/proctored_exam/confirm-decline.html

@@ -12,7 +12,7 @@
       {% endblocktrans %}
     </div>
     <div class="proctored-exam-skip-actions">
-      <button class="proctored-exam-skip-confirm-button btn btn-primary btn-base" data-ajax-url="{{enter_exam_endpoint}}" data-exam-id="{{exam_id}}">
+      <button class="proctored-exam-skip-confirm-button btn btn-pl-primary btn-base" data-ajax-url="{{enter_exam_endpoint}}" data-exam-id="{{exam_id}}">
         {% trans "Continue Exam Without Proctoring" %}
       </button>
       <button class="proctored-exam-skip-cancel-button btn btn-default btn-base">

edx_proctoring/templates/proctored_exam/ready_to_start.html

@@ -15,7 +15,7 @@
       {% endblocktrans %}
     </p>
     <div>
-      <button type="button" class="proctored-enter-exam btn btn-primary btn-base" data-action="start" data-exam-id="{{exam_id}}" data-change-state-url="{{change_state_url}}">
+      <button type="button" class="proctored-enter-exam btn btn-pl-primary btn-base" data-action="start" data-exam-id="{{exam_id}}" data-change-state-url="{{change_state_url}}">
         {% blocktrans %}
           Start my exam
         {% endblocktrans %}

edx_proctoring/templates/proctored_exam/ready_to_submit.html

@@ -12,13 +12,13 @@
       as well as achieve a final grade that meets credit requirements for the course.
     {% endblocktrans %}
   </p>
-  <button type="button" name="submit-proctored-exam" class="exam-action-button btn btn-primary btn-base" data-action="submit" data-exam-id="{{exam_id}}" data-change-state-url="{{change_state_url}}">
+  <button type="button" name="submit-proctored-exam" class="exam-action-button btn btn-pl-primary btn-base" data-action="submit" data-exam-id="{{exam_id}}" data-change-state-url="{{change_state_url}}">
     {% blocktrans %}
       Yes, end my proctored exam
     {% endblocktrans %}
   </button>
   {% if does_time_remain %}
-    <button type="button" name="goback-proctored-exam" class="exam-action-button btn btn-secondary btn-base" data-action="start" data-exam-id="{{exam_id}}" data-change-state-url="{{change_state_url}}">
+    <button type="button" name="goback-proctored-exam" class="exam-action-button btn btn-secondary btn-base" data-action="start" data-exam-id="{{exam_id}}" data-change-state-url="{{change_state_url}}" style="box-shadow: none">
       {% blocktrans %}
         No, I'd like to continue working
       {% endblocktrans %}

edx_proctoring/templates/timed_exam/ready_to_submit.html

@@ -10,13 +10,13 @@
       Make sure your answers are ready to be submitted, and then submit your exam. Your exam will then be graded.
     {% endblocktrans %}
   </p>
-  <button type="button" name="submit-proctored-exam" class="exam-action-button btn btn-primary btn-base" data-action="submit" data-exam-id="{{exam_id}}" data-change-state-url="{{change_state_url}}">
+  <button type="button" name="submit-proctored-exam" class="exam-action-button btn btn-pl-primary btn-base" data-action="submit" data-exam-id="{{exam_id}}" data-change-state-url="{{change_state_url}}">
     {% blocktrans %}
       Yes, submit my timed exam.
     {% endblocktrans %}
   </button>
   {% if does_time_remain %}
-    <button type="button" name="goback-proctored-exam" class="exam-action-button btn btn-secondary btn-base" data-action="start" data-exam-id="{{exam_id}}" data-change-state-url="{{change_state_url}}">
+    <button type="button" name="goback-proctored-exam" class="exam-action-button btn btn-secondary btn-base" data-action="start" data-exam-id="{{exam_id}}" data-change-state-url="{{change_state_url}}" style="box-shadow: none">
       {% blocktrans %}
         No, I want to continue working.
       {% endblocktrans %}