<div id="app">{{ count }}</div>

html, body {
  display: grid;
  justify-content: center;
  align-content: center;
  height: 100%;
  
  font-family: sans-serif;
  font-size: 2rem;
}

const app = Vue.createApp({
  data: function () {
    return { count: 3 }
  }
})

const vm = app.mount('#app')