Pro papers on a custom domain have the option to add their own custom HTML directly into the settings.
For Pro papers with a custom domain URL:
Once you have turned Custom Header or Footer toggle to ON, you will have the option to enter your own HTML to further customize your paper. Of course a little HTML knowledge helps!
Enter HTML into the Header and/or Footer
From your Paper Settings > Webpage > Custom domain options.
Turn custom header toggle to ON which will hide the Paper.li Main Menu (upper left) from your readers. It will also activate the Custom Header HTML editor.
Turn custom footer toggle to ON, which will hide the paper.li footer. It will also activate the Custom Footer HTML editor.
Be sure any code widgets use https protocol to ensure that the widget or embed shows in the header or footer.
If you have turned your custom header to ON, you have hidden the Paper.li Main Menu icon (upper left) from your readers. So how do you, the publisher, sign in to view your Paper Settings Dashboard and Edit mode button? Click "ESC" on your keyboard to sign-in and the menus will once again be visible.
If you are editing your paper via a mobile device, add /signin to the end of your paper URL and bookmark the URL for easier access. Adding the suffix /signin will activate the log-in in place of pressing "ESC" on your keyboard.