<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>504 Gateway Timeout</title> <link rel="stylesheet" href="custom_error.css"> </head> <body> <div class="center"> <img src="custom_504.png" alt="504"> </div> </body> </html>