diff --git a/frontend/modules/transport/pages/carriers/[id]/index.vue b/frontend/modules/transport/pages/carriers/[id]/index.vue
index ab433d2..5d260ea 100644
--- a/frontend/modules/transport/pages/carriers/[id]/index.vue
+++ b/frontend/modules/transport/pages/carriers/[id]/index.vue
@@ -450,10 +450,12 @@ function dataBorder(gi: number, i: number): string {
     const group = priceGroups.value[gi]
     const isLastRow = i === group.rows.length - 1
     const isLastGroup = gi === priceGroups.value.length - 1
+    // Couleur de bordure SIDE-SPECIFIC (border-b-*) : un `border-{color}` global
+    // ecraserait la couleur du bord droit noir de la colonne Transport.
     if (!isLastRow) {
-        return 'border-b border-m-muted/30'
+        return 'border-b border-b-m-muted/30'
     }
-    return isLastGroup ? '' : 'border-b-2 border-black'
+    return isLastGroup ? '' : 'border-b-2 border-b-black'
 }
 
 // ── Export XLSX des prix ─────────────────────────────────────────────────────