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Bootstrap class: .justify-content-*-around

<div class="d-flex justify-content-around">
  <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-around">...</div>
<div class="d-flex justify-content-md-around">...</div>
<div class="d-flex justify-content-lg-around">...</div>
<div class="d-flex justify-content-xl-around">...</div>

Preview

Flex item 1
Flex item 2
Flex item 3