<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>My App</title> <style> body { font-family: sans-serif; max-width: 600px; margin: 40px auto; padding: 0 20px; } </style> </head> <body> <h1>Hello!</h1> <p>This is a simple page.</p> </body> </html>
