diff --git a/src/defaultConfig.js b/src/defaultConfig.js
index 01cd38ed2..9a85e8c19 100644
--- a/src/defaultConfig.js
+++ b/src/defaultConfig.js
@@ -7,14 +7,14 @@ export default {
   },
   colors: {
     'black': '#000000',
-    'grey900': '#212b35',
-    'grey800': '#404e5c',
-    'grey700': '#647382',
-    'grey600': '#919eab',
-    'grey500': '#c5ced6',
-    'grey400': '#dfe3e8',
-    'grey300': '#f0f2f5',
-    'grey200': '#f7f9fa',
+    'grey-900': '#212b35',
+    'grey-800': '#404e5c',
+    'grey-700': '#647382',
+    'grey-600': '#919eab',
+    'grey-500': '#c5ced6',
+    'grey-400': '#dfe3e8',
+    'grey-300': '#f0f2f5',
+    'grey-200': '#f7f9fa',
     'white': '#ffffff',
     'red-dark': '#d43633',
     'red': '#f25451',