Vue Radio Button Default Checked

<html>
<head>
  <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
  <div id="app">
    <h3>Vue Js radio button default checked/selected</h3>
    <div class="radio-group" v-for='(option,index) in options'>
      <input type="radio" :id="index" v-model="selectedValue" :value="option">
      <label :for='index'>{{option}}</label>
    </div>
    <pre>Selected Value: {{selectedValue}}</pre>
  </div>
  <script type="module">
    const app = new Vue({
      el: "#app",
      data() {
        return {
          options: ['HTML', 'CSS', 'Javascript', 'Vue', 'Angular', 'React', 'Node'],
          selectedValue: 'CSS'
        }
      },
    });
  </script>
  <style scoped>
    /* Style for the radio buttons and labels */
    .radio-group {
      display: flex;
      flex-direction: row;
      gap: 8px;
    }

.radio-group label {
      cursor: pointer;
      font-size: 18px;
      color: #333;
      transition: color 0.2s;
      display: inline-flex;
      align-items: center;
    }

.radio-group input[type="radio"] {
      appearance: none;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      border: 2px solid #ccc;
      outline: none;
      transition: border-color 0.2s;
      margin-right: 8px;
    }

.radio-group input[type="radio"]:checked {
      border-color: #3498db;
    }

.radio-group input[type="radio"]:focus {
      box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.4);
    }

.radio-group label:hover {
      color: #3498db;
    }

.radio-group input[type="radio"]:checked+label {
      color: #3498db;
    }
  </style>
</body>

</html>