By default the store locator uses the existing styling of the current theme.
The app has several options that help with basic styling and positioning of elements, which is more than enough for most stores.
However, if you really need to customize the look and feel of the site, we have provided you with the ability to add custom CSS and custom Javascript. this will allow you or your web designer to get that perfect look and feel.
Take a look at this tutorial here, which covers how to apply themes and color schemes to the map!
https://w3trends.zendesk.com/hc/en-us/articles/115001620231-How-do-I-apply-color-schemes-themes-to-my-map-