<div id="app">
  <transition mode="in-out">
    <button v-bind:key="isEditing" @click="isEditing = !isEditing">
      {{ isEditing ? 'On' : 'Off' }}
    </button>
  </transition>
</div>

body {
  padding: 60px;
}

button {
  position: absolute;
  outline: none;
  border: none;
  
  padding: 10px 15px;
  border-radius: 5px;
  background: #23547B;
  color: #eee;
  cursor: pointer;
}

.v-enter {
  opacity: 0;
  transform: translateX(100%);
}
.v-leave-to {
  opacity: 0;
  transform: translateX(-100%);
}
.v-enter-active,
.v-leave-active {
  transition: 0.5s;
}

const vm = new Vue({
  el: '#app',
  data: {
    isEditing: true,
  },
});