I'm using a combination of Zurb's Off Canvas Layout and Galleria on a page.
Zurb's layout is used for the general structure and Galleria creates a photo viewer that can be switched to full-screen.
The HTML is basically like this (simplified):
<section role="complementary" style="z-index: 2;"> Sidebar Content </section>
<section role="main" style="z-index: 1;">
<div id="galleria"> [small images here, no problem with these]
<div class="fullscreen" style="width: 100%; height: 100%; z-index: 999;">
[fullscreen images go here, the sidebar appears above them]
</div>
</div>
</section>
Since the full-screen images container (z-index: 999) is contained in a lower z-index main than the complementary , when viewing the images in full-screen mode, the complementary sidebar appears above the images.
I would much rather not change these technologies I'm using and hoping someone has a CSS solution to this problem.
I already saw a discouraging post, but maybe someone knows something they don't?