Are you looking to take out the outline (dotted or otherwise) from around menu (and other) links in your WooCommerce store – these links show…
Storefront
Storefront is the name of the free official WooCommerce theme which is recommended as the best starting point for new WooCommerce installs.
Why recommended?
Simple really, just as WordPress is tested and updates are tested against usage on core themes, so too WooCommerce developers test that everything works in Storefront.
Align your testing regime with that of WooCommerce developers and you will find your theme is kept up-to-date more easily than if you rely on third party developers.
This is – a little – like saying we recommend to use Apple’s Operating System on your iPad or Apple Computer, instead of a custom OS.