<div class="m-sm-auto p-1 bg-primary d-inline-block">Spaced Div</div>
<div class="m-sm-auto p-1 bg-primary d-inline-block">Spaced Div</div>
<div class="m-sm-auto p-1 bg-primary d-inline-block">Spaced Div</div>
<div class="m-sm-auto p-1 bg-primary d-inline-block">Spaced Div</div>
You don't need to remember all CSS classes. Just use the Bootstrap Editor instead.