zen-8.x-7.0-alpha15/STARTERKIT/components/forms/progress-bar/progress-bar.twig

<div class="progress-bar {{modifier_class}}">
  <div class="progress-bar__bar"><div class="progress-bar__fill" style="width: 60%"></div></div>
  <div class="progress-bar__percentage">60%</div>
  <div class="progress-bar__message">Installing...</div>
</div>