diff --git a/webapp/package.json b/webapp/package.json
index 127e15623..a8cfb9016 100644
--- a/webapp/package.json
+++ b/webapp/package.json
@@ -44,7 +44,8 @@
     ],
     "moduleNameMapper": {
       "^@/(.*)$": "<rootDir>/src/$1",
-      "^~/(.*)$": "<rootDir>/$1"
+      "^~/(.*)$": "<rootDir>/$1",
+      "\\.(css|less)$": "identity-obj-proxy"
     },
     "testMatch": [
       "**/?(*.)+(spec|test).js?(x)"
@@ -122,6 +123,7 @@
     "eslint-plugin-vue": "~5.2.3",
     "flush-promises": "^1.0.2",
     "fuse.js": "^3.4.5",
+    "identity-obj-proxy": "^3.0.0",
     "jest": "~24.9.0",
     "mutation-observer": "^1.0.3",
     "node-sass": "~4.12.0",
diff --git a/webapp/yarn.lock b/webapp/yarn.lock
index a51aca386..b9dd64d1d 100644
--- a/webapp/yarn.lock
+++ b/webapp/yarn.lock
@@ -7861,6 +7861,11 @@ hard-source-webpack-plugin@^0.13.1:
     webpack-sources "^1.0.1"
     write-json-file "^2.3.0"
 
+harmony-reflect@^1.4.6:
+  version "1.6.1"
+  resolved "https://registry.yarnpkg.com/harmony-reflect/-/harmony-reflect-1.6.1.tgz#c108d4f2bb451efef7a37861fdbdae72c9bdefa9"
+  integrity sha512-WJTeyp0JzGtHcuMsi7rw2VwtkvLa+JyfEKJCFyfcS0+CDkjQ5lHPu7zEhFZP+PDSRrEgXa5Ah0l1MbgbE41XjA==
+
 has-ansi@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/has-ansi/-/has-ansi-2.0.0.tgz#34f5049ce1ecdf2b0649af3ef24e45ed35416d91"
@@ -8271,6 +8276,13 @@ icss-utils@^4.0.0, icss-utils@^4.1.1:
   dependencies:
     postcss "^7.0.14"
 
+identity-obj-proxy@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/identity-obj-proxy/-/identity-obj-proxy-3.0.0.tgz#94d2bda96084453ef36fbc5aaec37e0f79f1fc14"
+  integrity sha1-lNK9qWCERT7zb7xarsN+D3nx/BQ=
+  dependencies:
+    harmony-reflect "^1.4.6"
+
 ieee754@^1.1.4:
   version "1.1.13"
   resolved "https://registry.yarnpkg.com/ieee754/-/ieee754-1.1.13.tgz#ec168558e95aa181fd87d37f55c32bbcb6708b84"