diff --git a/datamodels/2.x/itop-portal-base/portal/public/css/bootstrap-theme-combodo.css b/datamodels/2.x/itop-portal-base/portal/public/css/bootstrap-theme-combodo.css
index f3418e72b..78ad943cf 100644
--- a/datamodels/2.x/itop-portal-base/portal/public/css/bootstrap-theme-combodo.css
+++ b/datamodels/2.x/itop-portal-base/portal/public/css/bootstrap-theme-combodo.css
@@ -4118,15 +4118,10 @@ button.close {
   background-color: #000;
   transition: all 0.3s linear;
 }
-.modal-backdrop.fade {
-  opacity: 0;
-  filter: alpha(opacity=0);
-}
 .modal-backdrop.in {
-  opacity: 0.5;
-  filter: alpha(opacity=50);
-  backdrop-filter: blur(2px);
-  -webkit-backdrop-filter: blur(2px);
+  background-color: rgba(0, 0, 0, 0.5);
+  backdrop-filter: blur(1px);
+  -webkit-backdrop-filter: blur(1px);
 }
 .modal-header {
   padding: 15px;
diff --git a/datamodels/2.x/itop-portal-base/portal/public/css/bootstrap-theme-combodo.scss b/datamodels/2.x/itop-portal-base/portal/public/css/bootstrap-theme-combodo.scss
index 27bcab454..f61e9810c 100644
--- a/datamodels/2.x/itop-portal-base/portal/public/css/bootstrap-theme-combodo.scss
+++ b/datamodels/2.x/itop-portal-base/portal/public/css/bootstrap-theme-combodo.scss
@@ -5107,15 +5107,10 @@ button.close {
     background-color: #000000;
     transition: all 0.3s linear;
 }
-.modal-backdrop.fade {
-    opacity: 0;
-    filter: alpha(opacity=0)
-}
 .modal-backdrop.in {
-    opacity: 0.5;
-    filter: alpha(opacity=50);
-    backdrop-filter: blur(2px);
-    -webkit-backdrop-filter: blur(2px);
+    background-color: rgba(0, 0, 0, 0.5);
+    backdrop-filter: blur(1px);
+    -webkit-backdrop-filter: blur(1px);
 }
 .modal-header {
     padding: 15px;