<div id="app">
  <p class="greeting">{{ greeting }}</p>
</div>

<script src="https://cdn.jsdelivr.net/npm/vue"></script>

<script>
var vm = new Vue({
  el: '#app',
  data: {
    greeting: '안녕! Vue.js :)'
  }
});
</script>
body {
  display: grid;
  justify-content: center;
  align-items: center;
  margin: 0;
  min-height: 100vh;
  background: #47b784;
  color: #fff;
  font-size: 6vw;
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.