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Bootstrap class: .pb-1 / pb-*-#

<div class="pb-0 bg-primary d-inline-block">Padded Div</div>
<div class="pb-1 bg-primary d-inline-block">Padded Div</div>
<div class="pb-2 bg-primary d-inline-block">Padded Div</div>
<div class="pb-3 bg-primary d-inline-block">Padded Div</div>
<div class="pb-4 bg-primary d-inline-block">Padded Div</div>
<div class="pb-5 bg-primary d-inline-block">Padded Div</div>

<!-- respsonsive viariations -->
<div class="pb-sm-5 d-inline-block bg-primary">Padded Div</div>
<div class="pb-md-5 d-inline-block bg-primary">Padded Div</div>
<div class="pb-lg-5 d-inline-block bg-primary">Padded Div</div>
<div class="pb-xl-5 d-inline-block bg-primary">Padded Div</div>

Preview

Padded Div
Padded Div
Padded Div
Padded Div
Padded Div
Padded Div
Padded Div
Padded Div
Padded Div
Padded Div