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<!DOCTYPE html>
<html>
<head>
  <title>v-bind background-color</title>
  <style>
    #app > div {
      width: 200px;
      padding: 20px;
      border: dashed black 1px;
    }
    .impClass {
      background-color: lightcoral;
    }
  </style>
</head>
<body>
<h1>Example: 'v-bind' used to change class.</h1>
<p>The browser sets class name to the value stored in the 'className' property inside the Vue instance.</p>
<div id="app">
  <div v-bind:class="className">
    Importance visualized by background color
  </div>
</div>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
<script>
  const app = Vue.createApp({
   data() {
    return {
      className: 'impClass'
    }
   }
  })
  app.mount('#app')
</script>
</body>
</html>