title: How to change the toolbar color in Ionic 4 with CSS
body: <p>I would like to change the background color through page.scss of ion-toolbar, ion-tab-bar and ion-tab-button.</p>
  
  <p>it works for ion-tab-bar and ion-tab-button but not for ion-toolbar.</p>
  
  <p>there is the code from page.scss:</p>
  
  <pre><code>ion-toolbar, ion-tab-bar, ion-tab-button {
  
      background-color: aquamarine;
  
  }
  </code></pre>
  
  <p>thanks for your help</p>