diff --git a/src/components/Theme/@types/component.ts b/src/components/Theme/@types/component.ts
index 94e8eb7e..b8e93e9e 100644
--- a/src/components/Theme/@types/component.ts
+++ b/src/components/Theme/@types/component.ts
@@ -47,8 +47,12 @@ export interface Theme {
   font: Font;
 }
 
+export interface CustomProperties {
+  [key: string]: string | number | boolean | object | [];
+}
+ 
 export interface CustomTheme {
   colour?: Partial<Colour>;
   font?: Partial<CustomFont>;
-  [key: string]: unknown;
+  customProperties?: CustomProperties;
 }