How to add border/shadow in color picker?

I'm using TwitterPicker now. I added white color to colors array.
Since this white color does not have any border color or box-shadow, users might not notice there's white color.

How do I add styling to it??

Start with the TwitterPicker component and reproduce the issue using a white entry in the colors array. Determine whether an individual color can receive a border or box-shadow; done means the white swatch is visibly distinguishable and the supported behavior is documented or verified.

Written by the indexing model from the issue text.