diff --git a/extension/jest.config.js b/extension/jest.config.js
index a56b83cd..b70a7b3e 100644
--- a/extension/jest.config.js
+++ b/extension/jest.config.js
@@ -2,4 +2,7 @@ module.exports = {
   setupFilesAfterEnv: ['<rootDir>/test/setup.js'],
   testPathIgnorePatterns: ['<rootDir>/examples'],
   testEnvironment: 'jsdom',
+  moduleNameMapper: {
+    '\\.css$': '<rootDir>/test/__mocks__/styleMock.ts',
+  },
 };
diff --git a/extension/test/__mocks__/styleMock.ts b/extension/test/__mocks__/styleMock.ts
new file mode 100644
index 00000000..ff8b4c56
--- /dev/null
+++ b/extension/test/__mocks__/styleMock.ts
@@ -0,0 +1 @@
+export default {};