Worked on unified theming and customization for SortableList components in the microsoft/fluentui-blazor repository, focusing on improving visual consistency and simplifying theme adoption across applications. Introduced CSS variables to control border, color, padding, and drop indicators, enabling developers to easily adjust component appearance through standardized theming. Extended the FluentSortableList component with new visual customization parameters, allowing for more granular control over styling. Updated documentation to clarify theming options and guide developers in leveraging these enhancements. Utilized Blazor, C#, and CSS to implement these changes, which streamline UI customization and support faster, more consistent branding across the Fluent UI Blazor suite.