# COLORTHEME System Variable [GstarCAD 2025](Help%20System/GSTARCAD/2025/Index.md) → [System Variables](Help%20System/GSTARCAD/2025/System%20Variables/(System%20Variables).md) → [C](Help%20System/GSTARCAD/2025/System%20Variables/C/(C).md) ## Function Description: The COLORTHEME system variable is used to control the interface theme color. You can set the ribbon, palette, and other interface elements to different theme colors. | | | | --- | --- | | Type | Integer | | Saved in | Registry | | Initial value | 0 | | Range | 0~5 | ## System Variable Value: **0:** Displays the GstarCAD theme **1:** Displays the Silver theme **2:** Displays the Lightblue theme **3:** Displays the Blue theme **4:** Displays the Black theme **5:** Displays the Aqua theme --- [Original help](https://www.gstarcad.net/help/GstarCAD_2025_en-US/detail/systemVariables_Cgsv/COLORTHEME.html) · © Gstarsoft Co., Ltd.