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HTML

              
                <h2>Modal window example 3</h2>

<button class="modal__show">Show Modal</button>

<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nostrum error, odit <a href="#">aperiam</a> aliquid distinctio sapiente amet, ratione mollitia expedita tempore necessitatibus <a href="#">odio</a> esse! Doloribus laboriosam voluptate fugit, <a href="#">ullam</a> pariatur ab?</p>

<ul>
  <li><a href="#">Element 1</a></li>
  <li><a href="#">Element 2</a></li>
  <li><a href="#">Element 3</a></li>
  <li><a href="#">Element 4</a></li>
  <li><a href="#">Element 5</a></li>
  <li><a href="#">Element 6</a></li>
  <li><a href="#">Element 7</a></li>
  <li><a href="#">Element 8</a></li>
  <li><a href="#">Element 9</a></li>
  <li><a href="#">Element 10</a></li>
</ul>

<div class="modal" id="modal" tabindex="0">
  <div class="modal__content">
    Modal
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Impedit qui, iusto numquam harum est officiis voluptate animi eligendi, incidunt saepe dolore. <a href="#">Adipisci</a> quos odio, optio aspernatur ex quae excepturi repudiandae.</p>
    
    <form action="#">
      <p>
        <label for="firstname">First name</label>
        <input type="text" id="firstname" />
      </p>
      <p>
        <label for="lastname">First name</label>
        <input type="text" id="lastname" />
      </p>
      
      <button>Send</button>
    </form>

    <button class="modal__close">
      close
    </button> <!-- .modal__close -->
  </div> <!-- .modal__content -->
</div> <!-- .modal -->
              
            
!

CSS

              
                .modal {
  background-color: rgba(0,0,0,0.5);

  height: 100vh;
  width: 100vw;

  position: absolute;
  left: 0;
  top: 0;

  display: none;
}

.modal--visible {
  display: flex;
  justify-content: center;
  align-items: center;
}

.modal__content {
  background-color: rgb(255, 255, 255);
  
  height: 70%;
  width: 70%;
  padding: 2rem;

  position: relative;
}

.modal__close {
  background-color: #000000;
  
  position: absolute;
  right: -1rem;
  top: -1rem;
  
  color: #ffffff;
}

:focus {
  outline: 4px solid #FF0000;
}
              
            
!

JS

              
                // Button to trigger the modal window
var button = document.querySelector('.modal__show');
// Variable for storing the last focused element
var lastFocusedElement;

// Open modal window on click
button.addEventListener('click', showModal);

// Show modal
function showModal() {
  // Close all open modal windows
  removeModal();
  // Store the last focused element
  lastFocusedElement = document.activeElement;
  // Select the modal window
  var modal = document.getElementById('modal');
  // Show the window
  modal.classList.add('modal--visible');
  // Focus the window
  modal.focus();
  // Add keydown event
  modal.addEventListener('keydown', function(e) {
    // Close the window by pressing the Esc-key
    if(e.keyCode === 27) {
      removeModal();
    }
  });
}

// Close the window by clicking the close button
document.querySelector('.modal__close').addEventListener('click', removeModal);

// Remove the modal window if it's visible
function removeModal() {
  var visibleClass = 'modal--visible';
  if (document.querySelector('.' + visibleClass)) {
    document.querySelector('.' + visibleClass).classList.remove(visibleClass);
    // Return the focus to the last focused element
    lastFocusedElement.focus();
  }
}
              
            
!
999px

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