diff --git a/static/mo.css b/static/mo.css
index 7dcf41627fcf49589e0437c14bdfd8833da9d03f..6796adad0767a50499d93370f949bafc347ac262 100644
--- a/static/mo.css
+++ b/static/mo.css
@@ -70,6 +70,12 @@ span.unknown {
 	color: red;
 }
 
+.has-tip {
+	text-decoration: underline dashed;
+}
+
+/* Tables */
+
 table.data {
 	border-collapse: collapse;
 	margin-top: 2ex;
@@ -388,6 +394,8 @@ div.alert + div.alert {
 	max-height: 100vh;
 }
 
+/* User messages */
+
 div.message {
 	padding: 5px 10px;
 	margin-bottom: 5px;