bootstrap 3 loader 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="d-flex align-items-center">
<strong>Loading...</strong>
<div class="spinner-border ml-auto" role="status" aria-hidden="true"></div>
</div>