<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<hr class="mt-2 mb-3"/>
<!-- OR -->
<hr class="my-12"/>
<!-- It's like -->
<hr class="mt-3 mb-3"/>
<div class="row">
<div class="col">col</div>
<div class="col">col</div>
<div class="w-100"></div>
<div class="col">col</div>
<div class="col">col</div>
</div>