Hello, My classes aren't toggling, I checked to see if things are same, it is but still not working and no error in console, following is my code

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
    <style>
        .blue{
            color: blue;
        }
        .green{
            color: green;
        }
    </style>
</head>
<body>
    <div id="app">
        {{greetings}} - <p>The text</p>
        <input type="text" name="" id="" v-model="greetings">
        <button :class="isActive? 'blue': 'green'" :click="toggle">Submit</button>
    </div>

    <script>
        Vue.createApp({
            data(){
                return{
                    greetings: 'hello world',
                    isActive: true,
                }
            },
            methods: {
                toggle(){
                    this.isActive = !this.isActive;
                }
            }
        }).mount("#app");

    </script>
</body>
</html>

Attribute Binding and Event Handling