Open bootstrap modal with vue.js 2.0

My code is based on the Michael Tranchida’s answer.

Bootstrap 3 html:

<div id="app">
  <div v-if="showModal">
    <transition name="modal">
      <div class="modal-mask">
        <div class="modal-wrapper">
          <div class="modal-dialog">
            <div class="modal-content">
              <div class="modal-header">
                <button type="button" class="close" @click="showModal=false">
                  <span aria-hidden="true">&times;</span>
                </button>
                <h4 class="modal-title">Modal title</h4>
              </div>
              <div class="modal-body">
                modal body
              </div>
            </div>
          </div>
        </div>
      </div>
    </transition>
  </div>
  <button id="show-modal" @click="showModal = true">Show Modal</button>
</div>

Bootstrap 4 html:

<div id="app">
  <div v-if="showModal">
    <transition name="modal">
      <div class="modal-mask">
        <div class="modal-wrapper">
          <div class="modal-dialog" role="document">
            <div class="modal-content">
              <div class="modal-header">
                <h5 class="modal-title">Modal title</h5>
                <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                  <span aria-hidden="true" @click="showModal = false">&times;</span>
                </button>
              </div>
              <div class="modal-body">
                <p>Modal body text goes here.</p>
              </div>
              <div class="modal-footer">
                <button type="button" class="btn btn-secondary" @click="showModal = false">Close</button>
                <button type="button" class="btn btn-primary">Save changes</button>
              </div>
            </div>
          </div>
        </div>
      </div>
    </transition>
  </div>
  <button @click="showModal = true">Click</button>
</div>

js:

new Vue({
  el: '#app',
  data: {
    showModal: false
  }
})

css:

.modal-mask {
  position: fixed;
  z-index: 9998;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, .5);
  display: table;
  transition: opacity .3s ease;
}

.modal-wrapper {
  display: table-cell;
  vertical-align: middle;
}

And in jsfiddle