fix image display

server/handle_account_totp_enroll.go

···
 	sess.Values["totp-secret"] = secret.String()
 	if err := sess.Save(e.Request(), e.Response()); err != nil {
 		s.logger.Error("error saving session", "error", err)
-
 		return helpers.ServerError(e, nil)
 	}
 

server/static/style.css

···
   margin-bottom: 1.5em;
 }
 
+.center {
+  justify-content: center;
+}
+
 .centered-body {
   min-height: 100vh;
   justify-content: center;

server/templates/totp_enroll.html

···
       <div class="alert alert-danger margin-bottom-xs">
         <p>{{ index .flashes.errors 0 }}</p>
       </div>
-      <img src="{{ .Image }}" class="totp-image" />
       {{ end }}
+      <div class="center">
+        <img src="{{ .Image }}" class="totp-image" />
+      </div>
       <form action="/account/totp-enroll" method="post">
         <input name="code" id="code" placeholder="Code" />
         <button class="primary" type="submit" value="Login">Enroll</button>