2.1 Box - Border Borders

.border all sides
.border-none no border
.border-t top
.border-b bottom
.border-l left
.border-r right

2.1.1 Box - Border - Colors Border colors

.border-default - uses the text color
.border-transparent - transparent
.border-pink - pink
.border-charcoal - charcoal
.border-frost - frost
.border-fog - fog
.border-moonstone - moonstone
.border-snow - snow
.border-red - red
.border-orange - orange
.border-yellow - yellow
.border-green - green
.border-blue - blue
.border-white - white

2.1.2 Box - Border - Radius Border radius

.radius-0 - none
.radius - 0.5rem all radius
.radius-s - 0.25rem all radius
.radius-l - 0.5rem left radius
.radius-r - 0.5rem right radius
.radius-t - 0.5rem top radius
.radius-b - 0.5rem bottom radius
.radius-l-0 - 0 left radius
.radius-r-0 - 0 right radius
.radius-t-0 - 0 top radius
.radius-b-0 - 0 bottom radius
.radius-l-s - 0.25rem left radius
.radius-r-s - 0.25rem right radius
.radius-t-s - 0.25rem top radius
.radius-b-s - 0.25rem bottom radius
.pill-l - 99999rem left radius
.pill-r - 99999rem right radius
.pill - 99999rem all radius
.circle - Same as .pill

2.1.3 Box - Border - Sizing Border sizing

.border-thin thin
.border-thick thick
.border-t-thick top
.border-b-thick bottom
.border-l-thick left
.border-r-thick right
.border-t-0 remove top border
.border-b-0 remove bottom border
.border-l-0 remove left border
.border-r-0 remove right border

2.2 Box - Invisible Invisible

Use .invisible for visibility: hidden;

2.3 Box - Shadow Shadow

Example
.shadow
<div class="shadow short">
<code>.shadow</code>
</div>