diff --git a/Bootstrap_new/css/theme-modern.css b/Bootstrap_new/css/theme-modern.css
index 018858a0..3dd27407 100644
--- a/Bootstrap_new/css/theme-modern.css
+++ b/Bootstrap_new/css/theme-modern.css
@@ -1423,3 +1423,8 @@ select[class*="selectpicker"],
 .icon-shape {
     flex-shrink: 0;
 }
+
+/* Force le bouton de fermeture en blanc pur */
+.btn-close-white {
+    filter: invert(1) grayscale(100%) brightness(200%) !important;
+}
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