Styling gallery and video captions vs image captions

I’m doing something simple: changing style of image, gallery, and video captions to centered italic. I entered this Additional CSS and it works perfectly for images:

.wp-block-image figcaption {
	font-size: 14px;
	text-align: center;
	font-style: italic;
}

For example, see caption “Cortegana”s Plaza de Toros”. I tried this to do the same to the bottom caption for a gallery:

.blocks-gallery-caption figcaption {
	font-size: 14px;
	text-align: center;
	font-style: italic;
}

This code, however, has no effect. For example, see caption “Sidewalk occupational mosaics”…

What am I doing wrong?

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