title: How do I change the color of just one element in a Mermaid sequence diagram?
body: <p>I'm using <a href="https://mermaid-js.github.io/mermaid/#/sequenceDiagram" rel="noreferrer">Mermaid to create a sequence diagram</a> in Markdown. I'd like to highlight some of the <em>participants</em> and to gray some of the arrows.</p>
  <p>I only see how to change the theme color, not how to change the color of a specific diagram element. Is it possible?</p>