diff --git a/css/chess.css b/css/chess.css
index 2ce5893..125f17c 100644
--- a/css/chess.css
+++ b/css/chess.css
@@ -369,7 +369,7 @@ button:disabled .silhouette {
 .badge img {
    width: 3em;
    height: 3em;
-   opacity: 33%;
+   opacity: 0.33;
    margin: 0;
 }