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User input: testDemo/hello.html 添加内联 CSS 样式，使其看起来更像一个简易网站
Patch:
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*** Begin Patch
*** Update File: testDemo/hello.html
<!DOCTYPE html>
<html>
<head>
    <title>Hello World Website</title>
    <style>
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            margin: 0;
            padding: 0;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            color: white;
            text-align: center;
        }
        
        .container {
            max-width: 800px;
            padding: 40px;
            background-color: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        
        h1 {
            font-size: 3.5rem;
            margin-bottom: 20px;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
            background: linear-gradient(45deg, #ff9a9e, #fad0c4);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        p {
            font-size: 1.2rem;
            line-height: 1.6;
            margin-bottom: 30px;
            opacity: 0.9;
        }
        
        .features {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
            margin: 30px 0;
        }
        
        .feature {
            background: rgba(255, 255, 255, 0.15);
            padding: 20px;
            border-radius: 12px;
            width: 180px;
            transition: transform 0.3s ease;
        }
        
        .feature:hover {
            transform: translateY(-5px);
            background: rgba(255, 255, 255, 0.25);
        }
        
        .feature h3 {
            margin-top: 0;
            color: #ffd166;
        }
        
        button {
            background: linear-gradient(45deg, #ff9a9e, #fad0c4);
            border: none;
            padding: 15px 40px;
            font-size: 1.1rem;
            color: #333;
            border-radius: 50px;
            cursor: pointer;
            font-weight: bold;
            transition: all 0.3s ease;
            margin-top: 20px;
        }
        
        button:hover {
            transform: scale(1.05);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
        }
        
        footer {
            margin-top: 40px;
            font-size: 0.9rem;
            opacity: 0.7;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>Hello World!</h1>
        <p>Welcome to this simple yet beautiful website demo. This page demonstrates how a few lines of CSS can transform basic HTML into an attractive web page.</p>
        
        <div class="features">
            <div class="feature">
                <h3>Responsive</h3>
                <p>Adapts to different screen sizes</p>
            </div>
            <div class="feature">
                <h3>Modern</h3>
                <p>Uses CSS gradients and effects</p>
            </div>
            <div class="feature">
                <h3>Interactive</h3>
                <p>Hover effects and transitions</p>
            </div>
        </div>
        
        <button onclick="alert('Welcome to our website!')">Click Me</button>
        
        <footer>
            <p>Created with ❤️ | Simple HTML & CSS Demo</p>
        </footer>
    </div>
</body>
</html>
*** End Patch