Simple Custom CSS

Hello people! I have a question about changing CSS in wordpress. So, I have been using the Simple Custom CSS plugin and everything was okay. Earlier I tried to modify something through the plugin using the inspection option in Chrome, but it went wrong (I don’t know how). Every change I made on Simple Custom CSS was not seen. After clearing the cache and updating the plugin, I succeded to make one modification, but the others don’t apply and I can’t see them in sources in the inspection part.

Pleaase help!!! Thank youu