Different Font Size In Mobile :)

Hello,

I'm using 19px font for the desktop view on my site but I want to make it smaller for mobile devices!

I'm using this CSS

@media (max-width: 768px) {
    body {
        font-size: 16px;
    }
}

But I'm not seeing any change.

Can you help me out?

Note: I'm using generate press typography for font size

Site link - https://exactblogging.com/elementor-black-friday-sale/