sidebar content for multiple pages - resume css

[gzahn]

I've been browsing the issue threads for a while to try to solve this and only one got close, :
#15 (comment)

I'm in the same boat. I have an academic CV that is more than 2 pages and I would like to add sidebar content to multiple pages.
The solution you gave in that issue thread works great if you only have 2 pages in your resume, because it places the new sidebar content on the last page. How could I get new sidebar content on, say, page 2 of 5? When I tried moving this chunk around, it totally screws everything else up. Thanks!

Your solution was some css:
/* sidebar for page2 */

.extra-sidebar {
top: 0;
padding-top: 0;
}

.extra-sidebar h1 {
display: none;
}

.extra-sidebar .level2:first-of-type {
margin-top: 0;
}

Then in the markdown:

Second page sidebar {.aside .extra-sidebar}

Title

"sidebar2 content"