diff --git a/app/static/css/minitimeline.css b/app/static/css/minitimeline.css
index b1707f667..73bf6487d 100644
--- a/app/static/css/minitimeline.css
+++ b/app/static/css/minitimeline.css
@@ -118,9 +118,8 @@
     bottom: 100%;
     left: 50%;
     transform: translateX(-50%);
-    border-width: 6px;
-    border-style: solid;
-    border-color: transparent transparent #f9f9f9 transparent;
+    border: 10px solid transparent;
+    width: 100%;
 }
 
 .assiduite-bubble::after {