diff --git a/creme/activities/static/chantilly/activities/css/activities.css b/creme/activities/static/chantilly/activities/css/activities.css
index 629643f2d..a074dd624 100644
--- a/creme/activities/static/chantilly/activities/css/activities.css
+++ b/creme/activities/static/chantilly/activities/css/activities.css
@@ -278,7 +278,6 @@
 
 .activities-list-brick .activity-item + .activity-item {
     margin-top: 20px;
-    border-top: 1px solid #dedede;
     border-top: 1px solid #ccc;
 }
 
diff --git a/creme/activities/static/icecream/activities/css/activities.css b/creme/activities/static/icecream/activities/css/activities.css
index 8cd601129..236d4271c 100644
--- a/creme/activities/static/icecream/activities/css/activities.css
+++ b/creme/activities/static/icecream/activities/css/activities.css
@@ -275,7 +275,6 @@
 
 .activities-list-brick .activity-item + .activity-item {
     margin-top: 20px;
-    border-top: 1px solid #dedede;
     border-top: 1px solid #ccc;
 }