diff --git a/integrations/tabcenter-reborn/cascade-tcr.css b/integrations/tabcenter-reborn/cascade-tcr.css
index 56ddf91..7ccf592 100644
--- a/integrations/tabcenter-reborn/cascade-tcr.css
+++ b/integrations/tabcenter-reborn/cascade-tcr.css
@@ -12,7 +12,7 @@
 
   position: absolute;
   top: 0; bottom: 0;
-  z-index: 1;
+  z-index: 3;
 
   min-width: 50px !important; max-width: 50px !important;
 
@@ -29,8 +29,8 @@
 
 [sidebarcommand*="tabcenter"] #sidebar { height: 100%; max-height: 100%; }
 
-#sidebar-box[sidebarcommand*="tabcenter"]:not([hidden]) ~ #appcontent { margin-left: 50px; }
-#main-window[inFullscreen][inDOMFullscreen] #appcontent { margin-left: 0; }
+#sidebar-box[sidebarcommand*="tabcenter"]:not([hidden]) ~ #tabbrowser-tabbox { margin-left: 50px !important; }
+#main-window[inFullscreen][inDOMFullscreen] #tabbrowser-tabbox { margin-left: 0 !important; }
 /* Removes gap between active tab highlight and edge of bar */
 #sidebar-box[sidebarcommand="tabcenter-reborn_ariasuni-sidebar-action"] #sidebar-header, #sidebar-box[sidebarcommand="tabcenter-reborn_ariasuni-sidebar-action"] ~ #sidebar-splitter {
     display: none;