This is very helpful, thanks. I don't understand why I can't change the "theme" colors for just the blog headers. Your image code works great, but the navigation colors are all screwed up now.
Site URL: https://prism-lobster-kwcp.squarespace.com/
Hi,
How can I get an image in the background of my header in individual blog posts? I want to match the design of the rest of the site pages. (example: https://prism-lobster-kwcp.squarespace.com/webinars/blog-post-title-three-w6t2p)