title: Loading mask, that disables underlying html elements
body: <p>I want to create loader mask for all page. I need to get the elements under the mask were not available. But now I can click buttons. you can see all on the image.</p>
  
  <p>here is css of mask:</p>
  
  <pre><code>div#mask {
      z-index:9999;
      display: none;
      width:100%;
      background-color: rgba(0,0,0,0.15);
  }
  </code></pre>
  
  <p>it's div with 100% width, and height of window. How to fix ui block?</p>
  
  <p><img src="https://i.stack.imgur.com/wLzfK.png" alt="enter image description here"></p>