diff --git a/css/backoffice/blocks-integrations/_all.scss b/css/backoffice/blocks-integrations/_all.scss
index af56b7dd7..f9c36e5ff 100644
--- a/css/backoffice/blocks-integrations/_all.scss
+++ b/css/backoffice/blocks-integrations/_all.scss
@@ -13,3 +13,4 @@
 @import "object-details-with-tab-container";
 @import "medallion-with-blocklist";
 @import "input-within-datatable";
+@import "jquery-blockui-within-dialog";
\ No newline at end of file
diff --git a/css/backoffice/blocks-integrations/_jquery-blockui-within-dialog.scss b/css/backoffice/blocks-integrations/_jquery-blockui-within-dialog.scss
new file mode 100644
index 000000000..c0f8eb6da
--- /dev/null
+++ b/css/backoffice/blocks-integrations/_jquery-blockui-within-dialog.scss
@@ -0,0 +1,9 @@
+/*!
+ * @copyright   Copyright (C) 2010-2021 Combodo SARL
+ * @license     http://opensource.org/licenses/AGPL-3.0
+ */
+$ibo-vendors-blockui--blockoverlay--within--dialog--background-color: $ibo-vendors-jqueryui--ui-dialog--background-color !default;
+
+.ui-dialog .blockUI.blockOverlay{
+  background-color: $ibo-vendors-blockui--blockoverlay--within--dialog--background-color;
+}
\ No newline at end of file
diff --git a/css/backoffice/vendors/_all.scss b/css/backoffice/vendors/_all.scss
index b5b691e2b..645f655bd 100644
--- a/css/backoffice/vendors/_all.scss
+++ b/css/backoffice/vendors/_all.scss
@@ -22,4 +22,5 @@
 @import "jqueryui";
 @import "jquery-multiselect";
 @import "datatables";
-@import "jquery-treeview";
\ No newline at end of file
+@import "jquery-treeview";
+@import "jquery-blockui";
\ No newline at end of file
diff --git a/css/backoffice/vendors/_jquery-blockui.scss b/css/backoffice/vendors/_jquery-blockui.scss
new file mode 100644
index 000000000..da53f0c3c
--- /dev/null
+++ b/css/backoffice/vendors/_jquery-blockui.scss
@@ -0,0 +1,18 @@
+/*!
+ * @copyright   Copyright (C) 2010-2021 Combodo SARL
+ * @license     http://opensource.org/licenses/AGPL-3.0
+ */
+
+$ibo-vendors-blockui--blockoverlay--background-color: $ibo-color-white-200 !default;
+$ibo-vendors-blockui--blockomsg--color: $ibo-color-grey-700 !default;
+
+.blockUI.blockOverlay{
+  background-color: $ibo-color-white-200;
+}
+.blockUI.blockMsg{
+  font-size: 6em;
+  text-align: center;
+  color: $ibo-color-grey-700;
+  border: none;
+  background-color: transparent;
+}
\ No newline at end of file
diff --git a/sources/application/WebPage/iTopWebPage.php b/sources/application/WebPage/iTopWebPage.php
index e11977f4b..f6fc8ce70 100644
--- a/sources/application/WebPage/iTopWebPage.php
+++ b/sources/application/WebPage/iTopWebPage.php
@@ -380,6 +380,11 @@ JS
 			PrepareWidgets();
 		}, 500);
 	});
+	
+	// Default values for blockui
+	$.blockUI.defaults.css = {}; 
+	$.blockUI.defaults.message= '<i class="fas fa-fw fa-spin fa-sync"></i>'; 
+	$.blockUI.defaults.overlayCSS = {} 
 JS
 		);