access pc via laptop

Hi guys.
My network is:

my smartphone connected to mikrotik via wifi
PC connected to mikrotik via eth.

On my PC in browser I can open address - demo.site
when I try to open demo.site via smartphone browser - it doesn’t connect

please assist, what need I do in mikrotik to allow connection to demo.site (which is on PC)

please note - demo.site it is local site at my PC.

thanks

Look up hairpin NAT. That’s what you need to configure.