diff --git a/theme/base/style/core.css b/theme/base/style/core.css
index 207e8e891a4..03c401fda60 100644
--- a/theme/base/style/core.css
+++ b/theme/base/style/core.css
@@ -893,3 +893,16 @@ sup {vertical-align: super;}
 #page-admin-setting-enrolsettingsflatfile.dir-rtl .informationbox {direction: ltr;text-align: left;}
 
 #page-admin-grade-edit-scale-edit.dir-rtl .error input#id_name {margin-right: 170px;}
+
+/* Forumpost unread
+-------------------------*/
+
+#page-mod-forum-view .unread,
+.forumpost.unread .row.header,
+.path-course-view .unread,
+span.unread {
+    background-color: #FFD;
+}
+.forumpost.unread .row.header {
+    border-bottom: 1px solid #DDD;
+}
\ No newline at end of file