Margin three
Margin right three
Margin bottom three
Margin horizontal three
Margin vertical three
<div class="m5">Margin three</div>
<div class="mr5">Margin right three</div>
<div class="mb5">Margin bottom three</div>
<div class="mh5">Margin horizontal three</div>
<div class="mv5">Margin vertical three</div>spacing.css, line 196