title: How to set just a percentage of a color in CSS?
body: <p>I have some GUI guidelines where these color are specified:</p>
  
  <pre><code>text-color: #000 87%
  background-color of the container: #000 20%
  </code></pre>
  
  <p>How can I apply those requirements in CSS?</p>
  
  <p>I have read this post:
  <a href="https://stackoverflow.com/a/12021283">https://stackoverflow.com/a/12021283</a></p>
  
  <p>But it didn't help me.</p>
  
  <p>Thanks in advance!</p>