How to change the font size in tabs?

Hi!

I’d like to change the font size of my texts with this code:

#content {
font-size: 14px;
}

Unfortunately, the code only changes the font size of the symbols outside my Shortcode Ultimate tabs. Every text that’s in the tabs doesn’t change at all. Is there a chance to solve this?

Here is an example page. The only font that I’m changing with the above code is the “zum Seitenanfang / Go to top” line at the very end of the page. It’s the only line that’s outside the tabs and hence the only one that’s getting changed.

Thanks!

https://wordpress.org/plugins/shortcodes-ultimate/