diff --git a/html/css/style-classic7.css b/html/css/style-classic7.css
index 0cf159ab0..3a882bf8c 100644
--- a/html/css/style-classic7.css
+++ b/html/css/style-classic7.css
@@ -123,11 +123,18 @@ h3.info {
     text-align:center;
 }
 
+ @keyframes error_h2 {
+     from {background-color:  hsl(358,60%,44%);}
+     to {background-color: hsl(359,100%,44%);}
+ }
+ h2.error {
+     background:#FF0000;
+     color:#FFFFFF;
+     animation-name: error_h2;
+     animation-duration: 4s;
+     animation-iteration-count: infinite;
+ }
 
-h2.error {
-    background:#FF0000;
-    color:#FFFFFF;
-}
 
 td.tool a.mtitle {
     text-decoration:none;