title: How to dynamically change css values (like color in whole app) etc
body: <p>I have one question...</p>
  
  <p>If you want conditional styling: you must use <code>ng-class</code> or <code>ng-style</code> construction.</p>
  
  <p>But...</p>
  
  <p>For example: I'm an admin, and I want to change color of my application with custom color from <code>colorpicker</code>. How can I change some code in css?</p>
  
  <p>For example I have this line in <code>style.css</code>:</p>
  
  <pre><code>body{
    background: #ffffff;
  }
  </code></pre>
  
  <p>(also all tags like a, h1 etc implement some color)</p>
  
  <p>and in controller I change this <code>#ffffff</code> to <code>#000000</code>.</p>
  
  <p>What is the best way to change this color in css, without using <code>ng-class</code> or <code>ng-style</code> on each tag in each controller?</p>