diff --git a/src/utils.css b/src/utils.css
new file mode 100644
index 00000000..85da4449
--- /dev/null
+++ b/src/utils.css
@@ -0,0 +1,25 @@
+/* stylelint-disable */
+/* This is an utility file that should not be included in production build */
+:global {
+  & .undefined {
+    position: fixed !important;
+    top: 0 !important;
+    right: 0 !important;
+    bottom: 0 !important;
+    left: 0 !important;
+    display: flex !important;
+    align-items: center !important;
+    justify-content: center !important;
+    background: red !important;
+    color: white !important;
+    font-weight: bold !important;
+    font-size: 30px !important;
+  }
+
+  & .undefined::after {
+    display: block !important;
+    padding: 15px 30px !important;
+    content: 'ERROR! You are missing a class definition in your css module! Inspect me to find out where.' !important;
+  }
+}
+/* stylelint-enable */