Hi laura.lee! Thanks for giving Feature Me a shot!
Looks like I should build in a better way to input/change CSS in the next version!
Per your questions, I’m glad you were able to get the CSS working! Cache is a common issue for styles. There are two types of cache to look out for. 1) browser cache and 2) server cache. Both of these can cause issues with what you described. If you use WP Supercache or similar you may have to clear both to get updates to appear.
And yes, unfortunately your styles will get lost when the update happens (which is why it’s a good idea for me to build a css input ?? )
If you’d like you can join sign up for the beta on the new version and test it out and let me know what you think. Beta users get advanced notice of when the final version is released. You can do so here https://www.phasechangedigital.com/plugins/feature-me-2-beta/
Again thanks for trying out Feature Me!