Как открыть модальное окно bootstrap без jquery и bootstrap.js?

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<button id="openModal">Открыть модальное окно</button>
<div id="myModal" class="modal">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title">Модальное окно</h5>
        <button type="button" class="close" data-dismiss="modal">&times;</button>
      </div>
      <div class="modal-body">
        <p>Это содержимое модального окна.</p>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Закрыть</button>
      </div>
    </div>
  </div>
</div>

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.modal {
  display: none;
  position: fixed;
  z-index: 1;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0,0,0,0.4);
}

.modal-dialog {
  margin: 10% auto;
  width: 80%;
  max-width: 500px;
}

.modal-content {
  background-color: #fefefe;
  margin: auto;
  border: 1px solid #888;
  padding: 10px;
}

.close {
  color: #aaa;
  float: right;
  font-size: 28px;
  font-weight: bold;
}

.close:hover,
.close:focus {
  color: black;
  text-decoration: none;
  cursor: pointer;
}

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var openModalBtn = document.getElementById("openModal");
var modal = document.getElementById("myModal");

openModalBtn.addEventListener("click", function() {
  modal.style.display = "block";
});

modal.addEventListener("click", function(event) {
  if (event.target === modal) {
    modal.style.display = "none";
  }
});