Remove background image on Thank You page.

I want my thank you page to have a white background.  It looks white in settings but when I go live to test it the page image is there.  The image makes the text unreadable.  How can I remove the image just from the thank you page?

Please add the custom CSS code below to remove the background image on Thank You page:

div#stage.form-all {

   background: none !important;

}

Here is the guide: https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes