/a></h3>
  <p>Hex color codes are used.</p>
  <ul>
  <li>6 digit color is RGB.</li>
  <li>8 digit color is RGBA.</li>
  </ul>
  <p>First letter <code>#</code> is conventional. Plugins ignore the
  first letter of color code, thus <code>?102938</code>,
  <code>\n11335577</code> are valid.</p>
  <p>Do not use characters outside of <code>0-9a-f</code> for color
  value.</p>
  <p>Following is a list of color options. If an option is missing,
  default color will be used.</p>
  <ul>
  <li><code>foreground</code>