Hi,
You will need to use the page-id- class which is generated for each page based off of the page ID from the back-end (see screenshot) before any element you wish to customize on a per page basis.
As an example, from my screenshot, the CSS for me would be
.page-id-9468 #header {background-color: aqua !important;}
This will only apply the above CSS if the class page-id-9468 is present, and this class will only ever be present on that specific page.
You will need to identify the page ID class for your page by inspecting the console (F12) and selecting the elements tab in your browser. Look for the body at the top of the document.
Thanks,
Kieran
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