title: How to convert css url to base64?
body: <p>How to convert css url to base64</p>
  
  <p>like:</p>
  
  <pre><code>&lt;link rel="stylesheet" href="data:text/css;base64,Ym9keSB7IHdpZHRoOiA5NjBweDsgbWFyZ2luOiBhdXRvO30gcCB7IGZvbnQtZmFtaWx5OiBWZXJkYW5hO30" type="text/css"&gt;
  </code></pre>