diff --git a/src/components/Molecules/Button/hooks/useButtonViewModel/__tests__/useButtonViewModel.test.ts b/src/components/Molecules/Button/hooks/useButtonViewModel/__tests__/useButtonViewModel.test.ts
index ecf9c62..d19e08d 100644
--- a/src/components/Molecules/Button/hooks/useButtonViewModel/__tests__/useButtonViewModel.test.ts
+++ b/src/components/Molecules/Button/hooks/useButtonViewModel/__tests__/useButtonViewModel.test.ts
@@ -49,7 +49,7 @@ describe('useButtonViewModel', () => {
       const { result } = renderHook(() => useButtonViewModel({ ...baseProps, size: 'sm' }));
 
       expect(result.current.sizes.height).toBe(36);
-      expect(result.current.sizes.fontSize).toBe('sm');
+      expect(result.current.sizes.fontSize).toBe('xs');
       expect(result.current.sizes.iconSize).toBe('small_16');
       expect(result.current.sizes.loadingSize).toBe('tiny_48');
     });
@@ -58,7 +58,7 @@ describe('useButtonViewModel', () => {
       const { result } = renderHook(() => useButtonViewModel({ ...baseProps, size: 'md' }));
 
       expect(result.current.sizes.height).toBe(44);
-      expect(result.current.sizes.fontSize).toBe('md');
+      expect(result.current.sizes.fontSize).toBe('sm');
       expect(result.current.sizes.iconSize).toBe('tiny_20');
       expect(result.current.sizes.loadingSize).toBe('small_64');
     });
@@ -67,7 +67,7 @@ describe('useButtonViewModel', () => {
       const { result } = renderHook(() => useButtonViewModel({ ...baseProps, size: 'lg' }));
 
       expect(result.current.sizes.height).toBe(52);
-      expect(result.current.sizes.fontSize).toBe('lg');
+      expect(result.current.sizes.fontSize).toBe('md');
       expect(result.current.sizes.iconSize).toBe('tiny_20');
       expect(result.current.sizes.loadingSize).toBe('small_64');
     });
@@ -76,7 +76,7 @@ describe('useButtonViewModel', () => {
       const { result } = renderHook(() => useButtonViewModel(baseProps));
 
       expect(result.current.sizes.height).toBe(44);
-      expect(result.current.sizes.fontSize).toBe('md');
+      expect(result.current.sizes.fontSize).toBe('sm');
     });
   });
 
diff --git a/src/store/index.ts b/src/store/index.ts
index 6d9878c..c23561f 100644
--- a/src/store/index.ts
+++ b/src/store/index.ts
@@ -13,7 +13,7 @@ export const useRubberDuckStore = create<IStoreState>((set) => ({
       const isDarkMode = config.darkMode ?? state.isDarkMode;
       return {
         isDarkMode,
-        colors: config.colors ?? (isDarkMode ? dark : light),
+        colors: { ...(isDarkMode ? dark : light), ...config.colors },
       };
     });
   },
diff --git a/src/store/types/IConfigureStore.ts b/src/store/types/IConfigureStore.ts
index 1846fc7..afefd6b 100644
--- a/src/store/types/IConfigureStore.ts
+++ b/src/store/types/IConfigureStore.ts
@@ -2,5 +2,5 @@ import type { IColors } from '../../tokens/colors';
 
 export interface IConfigureStore {
   darkMode?: boolean;
-  colors?: IColors;
+  colors?: Partial<IColors>;
 }