 focus is on a
  component. Highlight colors are also used for value of slider
  components (BarBox and VSlider).</li>
  <li><code>highlightAccent</code>: Same as <code>highlightMain</code>.
  Used for cosmetics.</li>
  <li><code>highlightButton</code>: Color to indicate focus is on a
  button.</li>
  <li><code>highlightWarning</code>: Same as <code>highlightMain</code>,
  but only used for parameters which requires extra caution.</li>
  <li><code>overlay</code>: Overlay color. Used to overlay texts and
  i