title: How to put a div in front of another div?
body: <p>I want to block users to click anywhere on the page except just on top div with a button.</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.topdiv {
    height: 90px;
  }
  
  .divBlocking {
    bottom: 0;
    left: 0;
    position: fixed;
    right: 0;
    top: 0;
    cursor: wait;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="topdiv" *ngIf="!blockContent"&gt;
    &lt;button&gt;Cancel&lt;/button&gt;
  &lt;/div&gt;
  &lt;div class="divBlocking" *ngIf="blockContent"&gt;&lt;/div&gt;
  
  &lt;div class="divApp"&gt;
    //application content/form/inputs
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>So whole screen is not clickable including the <code>tobdiv</code> than I don't want to. Changing <code>divBlocking=&gt;top: 90;</code> seems not work</p>