Vue Js Computed Property

<!DOCTYPE html>
<html>
<head>
    <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
</head>
<body>
    <div id="app">
        <h3>Vue Js Computed Property</h3>
        <p>Enter a number:</p>
        <input type="number" v-model="numberInput">
        <p>The square of the number is {{ square }}</p>
    </div>
    <script type="module">
        const app = Vue.createApp({
            data() {
                return {
                    numberInput: 0
                };
            },
            computed: {
                square() {
                    return this.numberInput * this.numberInput;
                }
            }
        });
        app.mount('#app');
    </script>
    <style scoped>
        #app {
            font-family: Arial, sans-serif;
            margin: 20px auto;
            padding: 20px;
            border: 1px solid #ccc;
            border-radius: 5px;
            max-width: 400px;
        }

h3 {
            font-size: 24px;
            font-weight: bold;
            margin-top: 0;
        }

p {
            font-size: 16px;
            margin-bottom: 10px;
        }

input {
            font-size: 16px;
            padding: 5px;
            border: 1px solid #ccc;
            border-radius: 5px;
            width: 100%;
            box-sizing: border-box;
        }
  </style>
</body>
</html>