404.html

<!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>Uh oh!</title>

    <link
      rel="apple-touch-icon"
      sizes="180x180"
      href="/static/img/apple-touch-icon.png"
    />
    <link
      rel="icon"
      type="image/png"
      sizes="32x32"
      href="/static/img/favicon-32x32.png"
    />
    <link
      rel="icon"
      type="image/png"
      sizes="16x16"
      href="/static/img/favicon-16x16.png"
    />
    <link rel="manifest" href="/site.webmanifest" />

    <link rel="stylesheet" href="static/css/normalize.css" />
    <link rel="stylesheet" href="static/css/requirements.css" />
  </head>
  <body>
    <main>
      <h1>404</h1>

      <p id="text">The page you're looking for doesn't exist.</p>
    </main>
  </body>
</html>