<span class="border"></span>
<span class="border-0"></span>
<span class="border-top-0"></span>
<span class="border-right-0"></span>
<span class="border-bottom-0"></span>
<span class="border-left-0"></span>

<span class="border border-primary"></span>
<span class="border border-secondary"></span>
<span class="border border-success"></span>
<span class="border border-danger"></span>
<span class="border border-warning"></span>
<span class="border border-info"></span>
<span class="border border-light"></span>
<span class="border border-dark"></span>
<span class="border border-white"></span>

<span class="border rounded"></span>
<span class="border rounded-top"></span>
<span class="border rounded-right"></span>
<span class="border rounded-bottom"></span>
<span class="border rounded-left"></span>
<span class="border rounded-circle"></span>
<span class="border rounded-0"></span>