Bootstrap CSS class .flex-*-nowrap

<div class="d-flex flex-nowrap"> ... </div>
<div class="d-flex flex-sm-nowrap"> ... </div>
<div class="d-flex flex-md-nowrap"> ... </div>
<div class="d-flex flex-lg-nowrap"> ... </div>
<div class="d-flex flex-xl-nowrap"> ... </div>