Reuse color

The currentColor properties refers to the specified color in that style.

From:

p {
  color: green;
  border: 1px solid green;
  padding: 5px;
}

To:

p {
  color: green;
  border: 1px solid currentColor;
  padding: 5px;
}

Why?

currentColor enables easier refactoring. If borders/box shadows etc... are meant to be tied to the color, use currentColor.