format invalid-input with a red background

diff --git a/site/style/game-list.css b/site/style/game-list.css
index fa0e216103e48d3c86d07cfe50f3fadb1d3faead..2cc3c0da17e84a6421192d04d1dcc81965c17316 100644 (file)
--- a/site/style/game-list.css
+++ b/site/style/game-list.css
@@ -93,6 +93,10 @@
     text-align: right;
 }
 
+.game-popup input.invalid-input {
+    background-color: red;
+}
+
 .game-popup .game-title {
     text-align: center;
 }