Bootstrap CSS class .justify-content-*-start

<div class="d-flex justify-content-start">
  <div class="p-2">Flex item 1</div>
  <div class="p-2">Flex item 2</div>
  <div class="p-2">Flex item 3</div>
</div>

<!-- responsive variations -->
<div class="d-flex justify-content-sm-start">...</div>
<div class="d-flex justify-content-md-start">...</div>
<div class="d-flex justify-content-lg-start">...</div>
<div class="d-flex justify-content-xl-start">...</div>