Move NextGEN Gallery Custom CSS using CSS Plugins
NextGEN Gallery has long offered a way for users to provide custom styles using CSS for their displayed galleries:. The Custom Styles feature in NextGEN Gallery is deprecated as of version 3.5.0 https://www.imagely.com/docs/custom-s...
he first method only allows you to save custom CSS for the currently active theme. If you change the theme, then you may need to copy and paste your custom CSS to the new theme. If you want your custom CSS to be applied regardless of which WordPress theme you are using, then this method is for you.