diff --git a/progros.css b/progros.css
index c51fa58..1ff6911 100644
--- a/progros.css
+++ b/progros.css
@@ -89,7 +89,7 @@ th:first-child {
 }
 
 #quit:active img {
-  aopacity: 0;
+  opacity: 0;
 }
 
 .window {