Image Caption Centered: Revisited in 2020

My captions are centered in the WordPress editor, but they are left-justified in the published view, as shown in the URL I've provided.

I tried adding the CSS described in this 2015 post, but it did not change the alignment:

https://generatepress.com/forums/topic/image-caption-centered/

Per the post above, I tried the following CSS -- in Simple CSS and in the Additional CSS areas in Customize for your theme. No change. Suggestions?

.wp-caption .wp-caption-text {
width: 100%;
text-align: center;
-moz-box-sizing: border-box;
-webkit-box-sizing: border-box;
box-sizing: border-box;
}