diff --git a/src/Hamming/App.hs b/src/Hamming/App.hs
index 6e12282..d2e9cfd 100644
--- a/src/Hamming/App.hs
+++ b/src/Hamming/App.hs
@@ -30,7 +30,7 @@ import Brick.AttrMap (attrMap)
 import Brick.Main (App (..), showFirstCursor)
 import Brick.Util (fg, style)
 import Graphics.Vty.Attributes (Attr (..), MaybeDefault (..), bold)
-import Graphics.Vty.Attributes.Color (green, red)
+import Graphics.Vty.Attributes.Color (green, red, yellow)
 
 import Hamming.App.Draw
 import Hamming.App.Events
@@ -44,9 +44,11 @@ mainApp = App
   , appHandleEvent  = eventHandler
   , appStartEvent   = return ()
   , appAttrMap      = const $ attrMap (style 0)
-    [ ( marginAttr,  fg green   )
-    , ( checkAttr,   style bold )
-    , ( zeroAttr,    fg red     )
+    [ ( marginAttr, fg green )
+    , ( checkAttr
+      , (style bold) { attrForeColor = SetTo yellow }
+      )
+    , ( zeroAttr, fg red )
     , ( validAttr
       , (style bold) { attrForeColor = SetTo green }
       )