DevTools: [SSP] fix "insert style rule" button on mac

Source/devtools/front_end/elementsPanel.css

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Anthony Ricaud <rik@webkit.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 581 matching lines @@
 }
 
 .sidebar-pane .metrics-and-styles,
 .sidebar-pane .metrics-and-computed {
     display: flex !important;
     flex-direction: column !important;
     position: relative;
 }
 
 .sidebar-pane .style-panes-wrapper {
+    transform: translateZ(0);
     flex: 1;
     overflow-y: auto;
     position: relative;
 }
 
 .sidebar-pane.composite .metrics-and-computed .sidebar-pane-toolbar,
 .sidebar-pane.composite .metrics-and-styles .sidebar-pane-toolbar {
     position: absolute;
 }
 
@@ skipping 135 matching lines @@
 
 .crumbs .crumb.selected, .crumbs .crumb.selected:hover {
     background-color: rgb(56, 121, 217);
     color: white;
     text-shadow: rgba(255, 255, 255, 0.5) 0 0 0;
 }
 
 .crumbs .crumb:hover {
     background-color: rgb(216, 216, 216);
 }