Margin one
Margin right one
Margin bottom one
Margin horizontal one
Margin vertical one
<div class="m">Margin one</div>
<div class="mr">Margin right one</div>
<div class="mb">Margin bottom one</div>
<div class="mh">Margin horizontal one</div>
<div class="mv">Margin vertical one</div>spacing.css, line 68