I use the last best practice to integrate google map into a web page in JS: https://developers.google.com/maps/documentation/javascript/adding-a-google-map

This method create a component shadow-root closed. So I can't change css insite this component.

If I add border-radius (2) on this element from the web dev inspector. Radius works on map.

How can i set border-radius on this element (1) with this google map integration ?

Is it possible?