flexbox column layout in bootstrap code example
Example 1: flex wrap bootstrap
<div class="d-flex flex-wrap">...</div>
Example 2: display flex usnig bootstrap
<div class="d-flex p-2 bd-highlight">I'm a flexbox container!</div>
<div class="d-flex flex-wrap">...</div>
<div class="d-flex p-2 bd-highlight">I'm a flexbox container!</div>