diff --git a/app/Resources/public/css/base.css b/app/Resources/public/css/base.css
index de354c93ee..421b08916d 100644
--- a/app/Resources/public/css/base.css
+++ b/app/Resources/public/css/base.css
@@ -9061,6 +9061,7 @@ input.form-control[type="color"] {
     position: -ms-sticky;
     position: -o-sticky;
     position: sticky;
+    z-index: 9999;
 }
 #chamilo-news .alert {
     margin-bottom: 0;