Patch failed

Error: Patch must start with '*** Begin Patch'

User input: 为 testDemo/hello.html 添加内联 CSS 样式，使其看起来更像一个简易网站。样式将包括：居中布局、背景渐变、字体美化、边框和阴影效果。

Patch:

text

*** Begin Patch ***
*** Update File: testDemo/hello.html
<!DOCTYPE html>
<html>
<head>
    <title>Hello</title>
    <style>
        body {
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            color: #333;
        }
        .container {
            background: rgba(255, 255, 255, 0.95);
            padding: 3rem 4rem;
            border-radius: 20px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            text-align: center;
            max-width: 600px;
            border: 1px solid rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(10px);
        }
        h1 {
            font-size: 3.5rem;
            margin-bottom: 1rem;
            color: #2d3748;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
            letter-spacing: 1px;
        }
        p {
            font-size: 1.2rem;
            line-height: 1.6;
            color: #4a5568;
            margin-bottom: 2rem;
        }
        .highlight {
            color: #667eea;
            font-weight: bold;
        }
        .button {
            display: inline-block;
            background: linear-gradient(to right, #667eea, #764ba2);
            color: white;
            padding: 0.8rem 2rem;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            letter-spacing: 0.5px;
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
        }
        .button:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(102, 126, 234, 0.6);
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>Hello, World!</h1>
        <p>Welcome to this <span class="highlight">beautiful</span> and <span class="highlight">modern</span> webpage.</p>
        <p>This page features a gradient background, centered layout, smooth shadows, and elegant typography.</p>
        <a href="#" class="button">Get Started</a>
    </div>
</body>
</html>
*** End Patch