title: Applying to all figcaption tags
body: <p>Unlike img/h/p and some other tags, I noticed I can't create a css for all figcaptions in a single block.<br>
  Currently I defined a block per figcaption but I'm afraid I missed some potential figcaption:  </p>
  
  <pre><code>.wp-block-embed figcaption {
    color: #ffffff;
  }
  
  .wp-block-image figcaption {
    color: #ffffff;
  }
  </code></pre>