bootstrap center 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="spinner-border text-primary" role="status">
<span class="sr-only">Loading...</span>
</div>
<div class="spinner-border text-secondary" role="status">
<span class="sr-only">Loading...</span>
</div>
<div class="spinner-border text-success" role="status">
<span class="sr-only">Loading...</span>
</div>
<div class="spinner-border text-danger" role="status">
<span class="sr-only">Loading...</span>
</div>
<div class="spinner-border text-warning" role="status">
<span class="sr-only">Loading...</span>
</div>
<div class="spinner-border text-info" role="status">
<span class="sr-only">Loading...</span>
</div>
<div class="spinner-border text-light" role="status">
<span class="sr-only">Loading...</span>
</div>
<div class="spinner-border text-dark" role="status">
<span class="sr-only">Loading...</span>
</div>
Example 3: bootstrap loader
<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>