<div id="app">{{ message }}</div>
  
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script>
  const app = new Vue({
    el: '#app',
    data: {
      message: 'Hello, Vue!'
    }
  })
</script>

#app {
  padding: 25px;
  border: 1px solid #ccc;
  color: #333;
  font-family: sans-serif;
}