<div class="successViewer">
  <span>{{ vm.correctAnswers }}</span>
  <span>{{ ' / ' + vm.total }}</span>
  <div>
    <span>{{ vm.lastAnswer | json }}</span>
  </div>
</div>

<div class="successViewer">
  <span>{{ vm.correctAnswers }}</span>
  <span>{{ ' / ' + vm.total }}</span>
  <div ng-if="vm.lastAnswer.success" class="last-answer-success">
    <span>Correct!</span>
  </div>
  <div ng-if="vm.lastAnswer.success === false" class="last-answer-fail">
    <span>That's not right. The correct answer is </span>
    <strong>{{ vm.lastAnswer.value }}</strong>
  </div>
</div>

Add success/not messages to successviewer
Add success/not messages to successviewer
