CS-Cart customization and theme development uses flexible layouts, add-ons, and simple templates. Developers can change colors, fonts, and page blocks with the built-in design editor. No coding is needed for basic edits. For advanced work, they update Smarty templates and CSS through a child theme. Webkul's CS-Cart customization also supports module-based edits using hooks and add-ons. This method keeps designs safe during updates. It developers help build unique storefronts, improve user experience, and keep sites fast, stable, and easy to update in the future.