How can I insert HTML code between posts?

Xavier

I found a previous discussion, in which I found that the place between posts is defined as "Post:after" in css, and I want to add some HTML code between posts, what should I do?
I have also considered to make an extension to do so, like should in this doc, https://docs.flarum.org/extend/frontend/, but I don't know what the area between posts is called, as in the example, it's in "HeaderPrimary"

GreXXL

Xavier maybe this is already what you are looking for: https://discuss.flarum.org/d/28506-davwheat-ad-units?

Xavier

GreXXL I have tried this extension, but it just couldn't work well with any codes except Google AdSense code. Other codes would be transform into pure string when I check the webpage source code.