Change gallery caption color, code not working

Hallo, I need help. I have a gallery for my mobile version and I need the captions on it to be white. I am using the same code for another block and it is working there… not on that block. Can you gimme a hand?

.uagb-block-94aec223.wp-block-gallery.has-nested-images figure.wp-block-image figcaption {
;
	color: #ffffff!important;
 }

Best regards.

The page I need help with: [log in to see the link]