diff --git a/src/main.css b/src/main.css
index 306a371..8a097eb 100644
--- a/src/main.css
+++ b/src/main.css
@@ -236,6 +236,8 @@ html {
         width:  3.5em;
         height: 3.5em;
 
+        text-shadow: 1px 1px 1px black;
+
         & > * {
             grid-row:    1;
             grid-column: 1;