DevTools: render category filters in a way that they don't clash.

Source/devtools/front_end/elements/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 438 matching lines @@
 .styles-element-state-pane.visible {
     border-bottom: 1px solid rgb(189, 189, 189);
     margin-top: 0;
 }
 
 .styles-element-state-pane > table {
     width: 100%;
     border-spacing: 0;
 }
 
-.styles-element-state-pane label {
-    display: flex;
-    margin: 1px;
+.styles-element-state-pane td {
+    padding: 0;
 }
 
 .styles-animations-controls-pane > * {
     margin: 6px 4px;
 }
 
 .styles-animations-controls-pane {
     border-bottom: 1px solid rgb(189, 189, 189);
     height: 56px;
     overflow: hidden;
@@ skipping 281 matching lines @@
 
 .style-properties li.editing-sub-part {
     padding: 3px 6px 8px 18px;
     margin: -1px -6px -8px -6px;
     text-overflow: clip;
 }
 
 .styles-pane-toolbar {
     float: right;
     margin-top: -3px;
+    background-color: rgba(255, 255, 255, 0.8);
 }
 
 .properties-widget-section {
     padding: 2px 0px 2px 5px;
-}
+}