This is technically correct, but you shouldn't really say this. 'Jó estét' implies a formal setting, so using 'szia' would be considered rude. And anyway, 'szia' and 'jó estét' are both greetings, you don't need 2 greetings in the same sentence.
There was a way to make the type on Duo bigger. It is hard to see the accents and it would be nice if they would also correct you when you missed one. Sometimes I get watch the accents as a comment. The accent on the i is almost imperceptible with a DOT over an i.