# Custom CSS Design your perfect checkout with custom styles. Every checkout has the ability to have custom CSS under the **Design** tab in the checkout editor. Custom CSS will only show on the published checkout, so when testing styles make sure to look at the public-facing checkout. We intentionally add `ID` and `class` to the HTML markup on checkouts to make it easier for you to pick and choose where you’d like to apply styles. Your developer should have no issue finding the appropriate `ID` and `class` to make any changes.