Changing .css makes page disappear – pls help!

I got some help here the other day to remove the top nav/header from a page. Adding this code via Custom CSS manager worked!

.page-id-5425 #outerheader {
display:none;
}

But now I need to add another page to the code.

I can’t figure out how to do that without making the first page disappear! I’ve tried different variations of commas and spaces, but nothing seems to work.

Any ideas?

.page-id-5425,page-id-5735 #outerheader {
display:none;
}

.page-id-5425, page-id-5735 #outerheader {
display:none;
}

.page-id-5425 page-id-5735 #outerheader {
display:none;
}

Here are the two pages:

https://pranabusiness.com/free-leadership-assessment
(page 5425, top nav/header removed, when I add page 5735 to css, this page goes blank)

https://pranabusiness.com/free-team-performance-survey
(page 5735, need top nav/header removed)