diff --git a/Build/Resources/Public/Less/TYPO3/_element_tceforms.less b/Build/Resources/Public/Less/TYPO3/_element_tceforms.less
index fad6c1627fafcbee960a383c153949bffd087a42..a92718e2f33507ef327f3e605418d140c3dd8cff 100644
--- a/Build/Resources/Public/Less/TYPO3/_element_tceforms.less
+++ b/Build/Resources/Public/Less/TYPO3/_element_tceforms.less
@@ -238,7 +238,7 @@ div.t3-form-field-container:first-child .t3-form-field-label-flex {
 .formengine-field-item.disabled {
 	position: relative;
 	.t3-form-field-disable {
-		z-index: 8000;
+		z-index: 100;
 		background: #fafafa;
 		display: block;
 		position: absolute;
@@ -252,7 +252,7 @@ div.t3-form-field-container:first-child .t3-form-field-label-flex {
 // z-index must be higher as .t3-form-field-disable z-index
 // this is required for the eval=null field checkbox
 .t3-form-field-eval-null-checkbox {
-	z-index: 9000;
+	z-index: 150;
 }
 .t3-form-palette-field-label {
 	text-indent: 2px;
diff --git a/typo3/sysext/backend/Resources/Public/Css/backend.css b/typo3/sysext/backend/Resources/Public/Css/backend.css
index eb52e702b77b440809d5d42bc4269f960ee0cdb9..033fa42abb77e58f2dbffde89e3e3278286506b8 100644
--- a/typo3/sysext/backend/Resources/Public/Css/backend.css
+++ b/typo3/sysext/backend/Resources/Public/Css/backend.css
@@ -11823,7 +11823,7 @@ div.t3-form-field-container:first-child .t3-form-field-label-flex {
   position: relative;
 }
 .formengine-field-item.disabled .t3-form-field-disable {
-  z-index: 8000;
+  z-index: 100;
   background: #fafafa;
   display: block;
   position: absolute;
@@ -11833,7 +11833,7 @@ div.t3-form-field-container:first-child .t3-form-field-label-flex {
   filter: alpha(opacity=50);
 }
 .t3-form-field-eval-null-checkbox {
-  z-index: 9000;
+  z-index: 150;
 }
 .t3-form-palette-field-label {
   text-indent: 2px;