remove header from one page

I want to remove the header from one page of a client’s website.

Here is the page: https://www.kevinruble.com/arch-2/. The page (or “post”) id is 590.

I’ve combed through the forums and tried many different solutions, both in CSS and PHP, to no avail.

I’ve tried adding the CSS to the custom CSS and directly to the Lifestyle CSS. I’ve also tried adding PHP code to the Omega “header.php” file, as Lifestyle has no such thing…no luck.

I’m using the Lifestyle child theme (parent=Omega). Any help greatly appreciated!