In order to add some CSS code to just a specific page, we can use Divi's options. Here are the instructions to do so:
Open the page builder
Click on the Page Settings icon on the bottom bar(5th icon)
Go to the Advanced tab and find the Custom CSS box, where you can add any custom CSS you need, just for that specific page
Any CSS placed in that section will exclusively affect that specific page. This is a valuable technique for concealing headers, footers, or other page elements, as well as adjusting the site's color scheme to align with a product or service featured on that page.