title: Changing the Overlay background color of sweet alert 2
body: <p>I have recently moved sweet alert 1 to sweet alert 2, but based on the documentation there is no option for theming the overlay background of an alert box like sweet alert 1</p>
  
  <pre><code>.swal-overlay {
    background-color: rgba(43, 165, 137, 0.45);
  }.
  </code></pre>
  
  <p>Please how can I achieve changing the overlay background of sweet alert 2?</p>