alceste Hi
Versatile GK Instyle template as mentioned in product info is by default, responsive to the core which automatically resizes, hide certain elements that can’t accomodate with smaller screens
The elements with certain CSS media queries coming from the template files get shrinked, or enlarged to make it look good on all devices (desktops, tablets, and phones)
Apart, The layout also resizes itself to accomodate with smaller screen sizes as seen with demo site
Precisely, To get this right for certain newly added elements etc, You may try add specific media query CSS in override.css file targeting certain breakpoint
You may debug and examine further with assistance of web developer - firefox and chrome to know about the specific element ID or class selector which you wish to add for responsiveness
To know Media query CSS concisely for certain devices and their breakpoints, You may refer to this
Still wishing to know precisely for certain element which isnt coming right for responsive mobile mode, Kindly provide screenshot marked with annotations showing the respective section enabling us to assist with the same