Second sidebar widget UL not styling as a list

I have two sidebars–one floating on the right and one floating on the bottom. The sidebar on the bottom floats to the effect of rows of three widget squares lining up horizontally.

The only problem is the UL lists that each widget creates doesn’t style as a list. For example, I have this css:

https://pastebin.com/zmvbUHtA

For this markup:

<ul id="footer_sidebar">
<?php if(!dynamic_sidebar('Footer')){ ?><li><!-- empty sidebar --></li><?php } ?>
</ul>

Let’s say there is an “Archives” widget that is supposed to show a list of months. I can use the #footer_sidebar li ul to target the list of months, but only to change text aspects like size and color. The list doesn’t seem to be registering as a list. Any clue on what is confounding this?

Thanks!