diff --git a/packages/survey-creator-core/src/creator-theme/creator-theme-model.ts b/packages/survey-creator-core/src/creator-theme/creator-theme-model.ts
index 7295735f53..51a03817c7 100644
--- a/packages/survey-creator-core/src/creator-theme/creator-theme-model.ts
+++ b/packages/survey-creator-core/src/creator-theme/creator-theme-model.ts
@@ -170,7 +170,7 @@ export class CreatorThemeModel extends Base implements ICreatorTheme {
   }
 
   private blockThemeChangedNotifications = 0;
-  public loadTheme(theme: ICreatorTheme = {}) {
+  public loadTheme(theme: ICreatorTheme = { themeName: CreatorThemeModel.defautlThemeName }) {
     this.blockThemeChangedNotifications += 1;
     try {
       const baseTheme = CreatorThemes[theme.themeName] || {};
diff --git a/packages/survey-creator-core/src/creator-theme/creator-themes.ts b/packages/survey-creator-core/src/creator-theme/creator-themes.ts
index 0ccb527007..42d7ae9fdf 100644
--- a/packages/survey-creator-core/src/creator-theme/creator-themes.ts
+++ b/packages/survey-creator-core/src/creator-theme/creator-themes.ts
@@ -1,21 +1,28 @@
+import { assign } from "../utils/utils";
+import designTabSurveyThemeJSON from "../designTabSurveyThemeJSON";
+
 export interface ICreatorTheme {
   themeName?: string;
   cssVariables?: { [index: string]: string };
 }
 
 export const PredefinedCreatorThemes: string[] = ["sc2020"];
+const sc2020CssVariables = {};
+assign(sc2020CssVariables, designTabSurveyThemeJSON.cssVariables, {
+  "--sjs-special-background": "#F3F3F3FF",
+  "--sjs-primary-background-500": "#19B394FF",
+  "--sjs-primary-background-10": "#19B3941A",
+  "--sjs-primary-background-400": "#14A48BFF",
+  "--sjs-secondary-background-500": "#FF9814FF",
+  "--sjs-secondary-background-25": "#FF981440",
+  "--sjs-secondary-background-10": "#FF98141A",
+  "--ctr-surface-background-color": "var(--sjs-special-background)",
+  "--ctr-toolbox-background-color": "var(--sjs-special-background)",
+});
+
 export const CreatorThemes: { [index: string]: ICreatorTheme } = {
   "sc2020": {
     themeName: "sc2020",
-    cssVariables: {
-      "--sjs-special-background": "#F3F3F3FF",
-      "--sjs-primary-background-500": "#19B394FF",
-      "--sjs-primary-background-10": "#19B3941A",
-      "--sjs-primary-background-400": "#14A48BFF",
-      "--sjs-secondary-background-500": "#FF9814FF",
-      "--sjs-secondary-background-25": "#FF981440",
-      "--sjs-secondary-background-10": "#FF98141A",
-      "--ctr-surface-background-color": "var(--sjs-special-background)",
-    }
+    cssVariables: sc2020CssVariables
   }
 };