Bootstrap Display Inline Block
<div class="d-inline-block"></div>
Zany Zebra
<div class="d-inline-block"></div><div class="visible">...</div>
<div class="invisible">...</div><!-- Bootstrap 4 -->
<div class="d-none"></div>
<!-- Bootstrap 3 -->
<!-- <div class="hidden-{screen size}"></div> -->
<div class="hidden-md"></div><div class="d-none"></div> for bootstrap 4<span class="d-block p-2 bg-primary text-white">d-block</span>
<span class="d-block p-2 bg-dark text-white">d-block</span>