How to reduce hestia slider text on mobile

If you'd like to make the slider section text smaller on mobile in Hestia then please navigate to Appearance -> Customize -> Additional CSS section and add the following code:

@media only screen and (max-width: 320px) {
font-size: 16px !important;

Save your changes and that's it! You could adjust the 16px to a lower or higher value if you wish.