--- a/devtools/client/themes/layoutview.css
+++ b/devtools/client/themes/layoutview.css
@@ -1,17 +1,17 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/ */
 
 .theme-sidebar {
   box-sizing: border-box;
 }
 
-body {
+.theme-sidebar body {
   /* The view will grow bigger as the window gets resized, until 400px */
   max-width: 400px;
   margin: 0px auto;
   padding: 0;
   /* "Contain" the absolutely positioned #main element */
   position: relative;
 }