code: func templateLogin(loginPath, linkingToken, redirectURI string, failed bool) string {
  	failedInfo := ""
  	if failed {
  		failedInfo = `<p class="alert alert-danger">Incorrect credentials</p>`
  	}
  
  	template := `
  <html>
    <head>
      <link rel="stylesheet"
            href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
    </head>
    <body>
      <div class="container">
      <h1>Login to your account</h1>
      <p class="alert alert-primary">
        Valid credentials are "%s" as the username and "%s" as the password
      </p>
      %s
      <form action="%s" method="POST">
        <input type="text" name="username" placeholder="Username">
        <input type="password" name="password" placeholder="Password">
        <input type="hidden" name="account_linking_token" value="%s">
        <input type="hidden" name="redirect_uri" value="%s">
        <button type="submit">Submit</button>
      </form>
      </div>
    </body>
  </html>
  `
  	return fmt.Sprintf(
  		template,
  		validUsername,
  		validPassword,
  		failedInfo,
  		loginPath,
  		linkingToken,
  		redirectURI,
  	)
  }
docs: // templateLogin constructs the signin form.