bootstrap 4.3 modal spinner 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="clearfix">
<div class="spinner-border float-right" role="status">
<span class="sr-only">Loading...</span>
</div>
</div>