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HTML

CSS

CSS Base

Vendor Prefixing

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JavaScript

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HTML

              
                <div class="container">
  <h2>You need to view on Chrome</h2>
  <button class="js-dialog-btn">Click to see dialog</button>
</div>

<dialog class="js-dialog">
  <h2>Hello!</h2>
</dialog>
              
            
!

CSS

              
                /* This is it - add any styles you want */
dialog::backdrop {
  background: rgba(48,155,212,0.75);
}


/* Below is not important for the example */
.container {
  margin: 0 auto;
  width: 450px;
}

h2 {
  text-align: center;
}

img {
  margin: 0 auto;
  display: block;
}

button {
  display: block;
  margin: 0 auto;
  padding: 5px 15px;
  background: #fff;
  border: 2px solid #309bd4;
  font-size: 18px;
}

button:hover {
  cursor: pointer;
}

dialog {
  min-width: 400px;
}
              
            
!

JS

              
                const btn = document.querySelector('.js-dialog-btn');
const dialog = document.querySelector('.js-dialog');

btn.addEventListener('click', () => {
  // ::backdrop only works when the dialog is invoked via   showModal()
  dialog.showModal();
});
              
            
!
999px

Console