Hi, Researching the forum (and also with google) on how to remove header & footer on a single page I have tried the following:

/* REMOVE HEADER & FOOTER ON SINGLE PAGE */
body.page-id-9599 div#imagecontainer {display: none;}
body.page-id-9599 .site-footer {display: none;}

/* REMOVE HEADER & FOOTER ON SINGLE PAGE */
.page-id-9599 .site-header,
.page-id-9599 .site-footer {display: none;}

/* REMOVE HEADER & FOOTER ON SINGLE PAGE */
.page-id-9599 .site-header {display: none;}
.page-id-9599 .site-footer {display: none;}

None of them work. Any ideas how I could get it to work?

This is the page in question:
http://www.dievogelschule.com/ann-ca...eien-sittiche/

My site runs on WP 4.7.3 & Atahualpa 3.7.24

Thanks,
Ann.

Where did you come up with the class 'site-header' and 'site-footer'?

to completely remove the header and footer use

body.page-id-9599 td#header {display: none;}
body.page-id-9599 td#footer {display: none;}

Thank you.

Is there also a way to suppress the (or use a different) background image that I have used as an ultrawide display extension on just this one page?

Ideally, I want the image that is now on the top of the page to expand in width to fill a container of fixed height as you can see here on my course platform: https://akademie.dievogelschule.com/...geien-sittiche

Also is there any way to add the menu back in?

Thanks,
Ann.

if you get a wonky security warning for the link, please use http instead of https (I need to fix that, too, obviously ...)