Utilities that define the space below stacked items.
          Author: Mary Ditchen 
          Since: 0.9.0 
          Source: /source/patterns/utilities/space-stacks.scss#L11
      
<!-- space stack -->
<div class="u-space-stack">Space Stack</div><!-- space stack compact -->
<div class="u-space-stack-compact">Space Stack Compact</div><!-- space stack tight -->
<div class="u-space-stack-tight">Space Stack Tight</div><!-- space stack loose -->
<div class="u-space-stack-loose">Space Stack Loose</div><!-- space stack expanded -->
<div class="u-space-stack-expanded">Space Stack Expanded</div><!-- space stack spacious -->
<div class="u-space-stack-spacious">Space Stack Spacious</div><!-- space stack zero -->
<div class="u-space-stack-zero">Space Stack Zero</div><!-- space stack xxxs -->
<div class="u-space-stack-xxxs">Space Stack XXXS</div><!-- space stack xxs -->
<div class="u-space-stack-xxs">Space Stack XXS</div><!-- space stack xs -->
<div class="u-space-stack-xs">Space Stack XS</div><!-- space stack sm -->
<div class="u-space-stack-sm">Space Stack Small</div><!-- space stack md -->
<div class="u-space-stack-md">Space Stack Medium</div><!-- space stack lg -->
<div class="u-space-stack-lg">Space Stack Large</div><!-- space stack xl -->
<div class="u-space-stack-xl">Space Stack XL</div><!-- space stack xxl -->
<div class="u-space-stack-xxl">Space Stack XXL</div><!-- space stack xxxl -->
<div class="u-space-stack-xxxl">Space Stack XXXL</div>