Vue Js Generate Random Background Color

<html>
<head>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
    <div id="app">
        <h1>Click to Change Background Color</h1>
        <button @click="changeBackgroundColor">New Background Color</button>
        <p id="colorCode">{{ backgroundColor }}</p>
        <p>Some text...</p>
    </div>
    <script type="module">
        const app = new Vue({
            el: "#app",
            data: {
                backgroundColor: "",
            },
            mounted() {
                this.changeBackgroundColor();
            },
            methods: {
                getRandomColor() {
                    const letters = "0123456789ABCDEF";
                    let color = "#";
                    for (let i = 0; i < 6; i++) {
                        color += letters[Math.floor(Math.random() * 16)];
                    }
                    return color;
                },
                changeBackgroundColor() {
                    const newColor = this.getRandomColor();
                    document.body.style.background = newColor;
                    this.backgroundColor = newColor;
                },
            },
        });
    </script>
    <style scoped>
        body {
            font-family: Arial, sans-serif;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            height: 100vh;
            margin: 0;
        }

#app {
            background-color: #fff;
            padding: 20px;
            border-radius: 5px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
            text-align: center;
        }

h1 {
            font-size: 32px;
            margin-bottom: 20px;
        }

button {
            background-color: #007bff;
            color: #fff;
            border: none;
            border-radius: 3px;
            padding: 10px 20px;
            cursor: pointer;
            font-size: 18px;
            margin-bottom: 20px;
            transition: background-color 0.3s ease;
        }

button:hover {
            background-color: #0069d9;
        }

p {
            font-size: 24px;
        }
        
        #colorCode {
            font-size: 18px;
            margin-top: 10px;
            color: #333;
        }
    </style>
</body>
</html>