How to change caption text size and/or padding?

Site URL: https://www.sensebellum.com/portfolio

I am struggling to figure out how to change either the text size or padding for a "poster caption" on an image block.

I have tried lots of CSS but nothing seems to work.

How can I make the text smaller? Or, how can I add padding? I am trying to have the text: "The Sensatorium" not get chopped off at the end. Pretty simple. Kind of hard to figure out.

Anyone have any ideas?

Add to Home > Design > Custom CSS

.design-layout-poster figcaption * {
    font-size: 1em !important;
}