diff --git a/bt5/erp5_code_mirror/SkinTemplateItem/portal_skins/erp5_code_mirror/code_mirror_support.xml b/bt5/erp5_code_mirror/SkinTemplateItem/portal_skins/erp5_code_mirror/code_mirror_support.xml
index d3174206fc93fd0de0d09a6036e2c85ccb0d654e..4617bddaeb9d60a1df60c8812376ddbd7f55f372 100644
--- a/bt5/erp5_code_mirror/SkinTemplateItem/portal_skins/erp5_code_mirror/code_mirror_support.xml
+++ b/bt5/erp5_code_mirror/SkinTemplateItem/portal_skins/erp5_code_mirror/code_mirror_support.xml
@@ -125,7 +125,7 @@
    bottom: 0;\n
    top: 0 !important;\n
    left: 0 !important;\n
-   z-index: 4242 !important;\n
+   z-index: 2 !important;\n
    overflow: hidden !important;\n
  }\n
 \n