how to make a loader for website bootstrap code example

Example 1: bootstrap loader

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

Example 2: bootstrap loader

<button class="btn btn-primary" type="button" disabled>
  <span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span>
  <span class="sr-only">Loading...</span>
</button>
<button class="btn btn-primary" type="button" disabled>
  <span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span>
  Loading...
</button>

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