Where to put the custom css file

Hello

Firstly i’d like to compliment you on this great plugin.

I am editing the css file to fix the height of the feed, but I don’t want it to be overwritten if there’s an update.

I have a child theme and copied jquery.minitwitter.css into my child folder with the altered height, but it is still taking the style from the original file.

Where should I put the jquery.minitwitter.css file to make it work?

Thank you

Tom

https://www.ads-software.com/extend/plugins/mini-twitter-feed/