Phpmyadmin tunnel AWS Lightsail - localhost:80” is invalid

The syntax for creating a tunnel is as follows:

ssh -N -L 127.0.0.1:8888:localhost:80 -i /Users/me/Desktop/LightsailDefaultKey.pem user@xx.xxxxx.com

However I cannot enter "localhost:80" app returns message The value “localhost:80” is invalid.

Is there any other way to solve this?

Thanks

Duh - My bad - solution simply use "port 80"