diff --git a/acl.cool/site/css-sample.dj b/acl.cool/site/css-sample.dj
index c5f00a1..b1b42b5 100644
--- a/acl.cool/site/css-sample.dj
+++ b/acl.cool/site/css-sample.dj
@@ -21,7 +21,7 @@ def map' {α β : Type} (f : α → β) : List α → List β
   | [] => []
   | x :: xs => f x :: map' f xs
 
-theorem fuse {α β γ} : ∀ (xs : List α) (f : α → β) (g :β → γ),
+theorem fuse {α β γ} : ∀ (xs : List α) (f : α → β) (g : β → γ),
   (map' g ∘ map' f) xs = map' (g ∘ f) xs := by
   intro xs f g
   induction xs