Wexley: Remove Header and add button to close lightbox

Hi, I am using Wexley and I would like to have a full screen slideshow. 

I already found out, that the header can be put away like this:

<style>
#header { display: none; }
</style>

Unfortunately the button "x" also goes lost. Is there a way to add the "x" to the full screen gallery or only hide the Site Title and Navigation and keep the "x" in the header?

Thanks in advance!

Can you share link to your site?

The page is: https://pineapple-cinnamon-4wjc.squarespace.com/, Password: mensch

Thanks!

6 hours ago, mrzfoto said:

The page is: https://pineapple-cinnamon-4wjc.squarespace.com/, Password: mensch

Thanks!

"X" icon? what is that. I don't see...

With "x" icon I refer to the button to close the lightbox.
It would be nice to have a lighbox like in the picture, with black background and < > navigation (it's there but not display), without the site navigation and site title - and if possible a button to push fullscreen (like in Youtube where the picture covers the whole page)

In the Wexley template the page displays this kind of slideshow when displaying the contents of a so called "summary".

@mrzfoto

<style>
  header#header *:not(#backToThumbs) {
    display: none;
}
</style>

thank you for your help!

still it's not working out completely, because I would only like the header to be hidden in slideshow, if I use the code it's hidden for the entire page. also I would especially like to hide the header during slideshow, because I would like the slideshow to be as fullscreen as possible.
anyhow, I am going to look at it with a programmer, so thank you, appreciate your help!

This was the code that did the job in the end:

 .collection-type-gallery.full-view #backToThumbs {
  font-size: 3.0em;
}
 .collection-type-gallery.full-view #logo, .collection-type-gallery.full-view #topNav {
     display: none;
 }