Bootstrap spinner

<div class="spinner-border" role="status">
  <span class="sr-only">Loading...</span>
</div>

Source: getbootstrap.com

Bootstrap loader

<div class="d-flex align-items-center">
  <strong>Loading...</strong>
  <div class="spinner-border ml-auto" role="status" aria-hidden="true"></div>
</div>

Source: getbootstrap.com

Bootstrap 4 spinner

<div class="spinner-border spinner-border-sm" role="status">
  <span class="sr-only">Loading...</span>
</div>
<div class="spinner-grow spinner-grow-sm" role="status">
  <span class="sr-only">Loading...</span>
</div>

Source: getbootstrap.com

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