diff --git a/client.sample.happy-dev.css b/client.sample.happy-dev.css
index f75cb0a..2ce6bdc 100644
--- a/client.sample.happy-dev.css
+++ b/client.sample.happy-dev.css
@@ -27,6 +27,12 @@
   /* Header's elements */
   --color-header-background: var(--color-white);
   --color-bell: var(--color-complementary-darken);
+  --color-notification-counter-number: black;
+  --color-notification-summary: #7A7F85;
+  --solid-notifications-theme: var(--color-primary);
+  --color-notification-item-border: #E4E8ED;
+  --color-notification-scrollbar-background: #EDF1FA;
+  --color-notification-scrollbar-track: #BDC2D7;
   --color-user-panel-header-text: var(--color-complementary-darken);
   --color-user-panel-header-background: var(--color-white);
   --color-user-panel-header-text-open: var(--color-white);