Hi @tuanphan
I have a similar issue. I need the headers of my individual blogs to be black as my logo is white, but I also want the titles mentioned below the logo in the header to be seen.
I used the following code you had given on this blog and it worked but my titles below the logo are missing.
body:not(.homepage) .header-announcement-bar-wrapper.black, body:not(.homepage) header#header {
background-color: black !important;}
Can you please help me out such that the header background is black but the page titles below the logo in the header are also visible?
Here is my blog page: https://lily-hexaflexagon-ppt7.squarespace.com/blog/lithium-ion-batteries-are-here-to-stay-heres-why
Here is the link to the website: https://lily-hexaflexagon-ppt7.squarespace.com/poweredby