HTML/CSS - Simple AI Chat Online Editor and JavaScript Compiler

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Simple AI Chat</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: Arial, sans-serif;
        }
        
        body {
            background-color: #f5f5f5;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        
        .chat-container {
            width: 90%;
            max-width: 600px;
            margin: 30px auto;
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
css
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