full page loader bootstrap 4 code example

Example 1: circlular waiting icon bootstrap

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

Example 2: bootstrap loader

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