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HTML

              
                <button id="openDialog">Open Dialog</button>

<dialog id="sampleDialog">
  <h1>Dialog Title</h1>
  <p>This is a simple dialog. You can interact with the page while this is open.</p>
  <!-- Close button inside the dialog -->
  <button id="closeDialog">Close</button>
</dialog>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus finibus consequat nulla, a laoreet ipsum blandit ac. Aliquam erat volutpat. Cras in sollicitudin libero. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus pretium, sem et tempus blandit, dui velit gravida ante, non porta velit justo at erat. Curabitur ac neque vitae lectus vehicula cursus at nec massa.</p>
<p>Mauris quis facilisis tortor. Nunc convallis eget nulla nec tincidunt. Sed ac venenatis est, at molestie purus. Proin nec ex dictum, ullamcorper justo in, porttitor quam. Suspendisse eget facilisis odio. Duis ex diam, ultrices ac lacus a, maximus tristique urna. Sed ultrices sit amet nisi vel sodales.</p>

              
            
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CSS

              
                
              
            
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JS

              
                const dialog = document.getElementById('sampleDialog');
const openButton = document.getElementById('openDialog');
const closeButton = document.getElementById('closeDialog');

// Event listener to open the dialog
openButton.addEventListener('click', function() {
  dialog.showModal();
});

// Event listener to close the dialog
closeButton.addEventListener('click', function() {
  dialog.close();
});
              
            
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999px

Console