@Leliekevertje
Google Maps API provides styling capabilities: https://developers.google.com/maps/documentation/javascript/styling

There is a quite extensive collection of styles you can utilize here: https://snazzymaps.com/explore. Just copy the given JSON from snazzymaps into the styles parameter of GMaps API.

You could add the map using the iframe module (https://github.com/desertblade/iFrame). Provide the URL you linked to in your post in the configuration; or any other Google Maps URL.