23 need help with psuedo selector

I’m having the same problem. I can’t find anything wrong with my code, but it keeps coming up with the error ‘Oops, try again. Did you give your third paragraph a font-size of 26px? It looks like it’s currently undefined.’ I can’t continue the course! My code is:

body :nth-child(4) {
font-size: 26px;

What is the problem? Many thanks for those of you who reply!

Can i see the rest of your css code and all of your html code?

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