How can I customize the design of a Bold Upsell pop-up?
You can customize the appearance of Bold Upsell pop-ups using CSS styling. A CSS styling guide to help you achieve the desired look and feel for your upsell can be found here - https://support.boldcommerce.com/hc/en-us/articles/360045490271-Bold-Upsell-CSS-Styling-Guide.
If you require complex customizations that are not covered in the guide, you can contact our Partner team for assistance with development here - https://www.storetasker.com.