Bootstrap CSS class .order-*-#

<div class="d-flex flex-nowrap">
  <div class="order-8 p-2">First flex item</div>
  <div class="order-12 p-2">Second flex item</div>
  <div class="order-3 p-2">Third flex item</div>
</div>

<!-- responsive variations -->
<div class="order-sm-3">Flex item</div>
<div class="order-md-3">Flex item</div>
<div class="order-lg-3">Flex item</div>
<div class="order-xl-3">Flex item</div>