Change colour of sidebar content

The text in the sidebar on my site https://www.pics-elated.com has changed colour so it can not be seen. This may (or may not, I am very amateur!) be connected to a plug-in I had previously used to format some text which is now giving me a message to say it isn’t working.

I can’t see where colour of sidebar content text can be changed, sorry for the dumb question, any help appreciated.