diff --git a/src/constants.js b/src/constants.js
index 5e7f829..17734bf 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -12,8 +12,8 @@ export const DEFAULT_THEME = {
   },
   grid: {
     containLabel: true,
-    left: 10,
-    right: 10
+    left: '10%',
+    right: '10%'
   }
 }