By default Foundation uses a `#1779ba transparent transparent`
transparent border. We were overriding the whole border, when we only
needed to override the top border. Furthermore, we were overriding it
twice: once in the public area and once in the admin area. However, if
we use `currentcolor`, we only have to override it once, and in both
cases the border will have the same color as the text surrounding it
(white in the public area and black in the admin area).
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