diff --git a/resources/report/report.html b/resources/report/report.html
index 532b065b..8578e1be 100644
--- a/resources/report/report.html
+++ b/resources/report/report.html
@@ -146,6 +146,10 @@
             border: none;
             -webkit-user-select: none;
         }
+        input:invalid {
+            background-color: pink;
+            color: white;
+        }
         td input {
             width: 100%;
             text-overflow: ellipsis;