title: Text background color in RichTextFx CodeArea
body: <p>I'm using RichTextFx (CodeArea) to highlight my code. I want to change text background color for some keywords and use css below:</p>
  <pre><code>.parameter {
      -rtfx-background-color: yellow;
  }
  </code></pre>
  <p>But it's changes background color for all text between my keywords (<code>:p1</code> and <code>:p2</code> in this example). Font color and style change successfully.
  <a href="https://i.stack.imgur.com/Wkmau.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Wkmau.png" alt="enter image description here" /></a></p>