NextGen Pro Gallery custom styles not working

Network — Gallery — “Default style” has been changed to my custom style
and
Gallery — Other Options — Styles — “What stylesheet would you like to use?” has been changed to my custom style.

But I can’t see the change from the gallery.

NextGEN Gallery Version 2.0.33
NextGEN Pro Version 1.0.6

My custom style is as below:

/*
CSS Name: My Custom Styles
Description: NextGEN Custom Gallery Stylesheet for me
Author: me
Version: 1.0
*/

.galleria-info-title,
.galleria-info-description {
font-style: italic !important;
}

https://wordpress.org/plugins/nextgen-gallery/