Unkown highlight?

#1

Hi!
I accidentally pressed some shortcut while coding and can not figure out what is the shortcut or what is it. I attach the image about the result. I can not remove this highlight (?). It is really embarrassing, can anybody help me to remove this?
image: https://imgur.com/AelhJPt

#2

That highlight generally indicates that your code is broken, probably because of a misplaced bracket. Please post another screenshot where we can see the whole line where the code first starts to appear in red.

#3

Thank you I`ve found the problem, I missed a single quote.