index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>API Integration Example</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <div class="container">
        <h1>API Interaction Tool</h1>
        <div class="input-field">
            <label for="apiKey">API Key:</label>
            <input type="text" id="apiKey" placeholder="Enter your API Key">
        </div>
        <div class="input-field">
            <label for="userInput">Your Message:</label>
            <textarea id="userInput" placeholder="Enter your message here"></textarea>
        </div>
        <button id="apiCallButton">Call API</button>
        <div id="apiResponse"></div>
    </div>
    <script src="script.js"></script>
</body>
</html>