body { font-family: Arial, sans-serif; line-height: 1.6; color: #333; max-width: 800px; margin: 0 auto; padding: 20px; } h1 { font-size: 24px; margin-bottom: 10px; } p { margin-bottom: 15px; } label { display: block; font-weight: bold; margin-bottom: 5px; } input[type="text"] { width: 100%; padding: 8px; box-sizing: border-box; border: 1px solid #ccc; border-radius: 4px; font-size: 16px; } button { display: block; width: 100%; padding: 10px; background-color: #007BFF; color: white; border: none; border-radius: 4px; font-size: 16px; cursor: pointer; margin-top: 20px; } button:hover { background-color: #0056b3; } .error { color: red; font-weight: bold; }