In your agent admin, navigate to Settings and, in the dropdown, select Display.
Halfway down the page, you'll find a setting to choose the styling of the map on your website. This is a feature available on the premium plan only. There are 9 to choose from.
Simply select a map style and save your changes at the bottom of the page.
The map styles only change the color/hue and font of the map. This does not change the location or size of the map.