Hi there,
try #f4f4f4 for the background color of the sidebar -the section/column that’s either to the right or left of the post/page.
and I have another question: I’ve noticed that when people subscribe I don’t get a email notification that it happened, so if I have to send them something (like when the book’s ready) I don’t know who they are. Is there a way to be notified about subscribers and their email address?
Thank you for your help