gecko/browser/themes/gnomestripe/devtools/layoutview.css

/* 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/. */

body {
  background: url(layout-background.png), -moz-radial-gradient(50% 70%, circle cover, hsl(210,53%,45%) 0%, hsl(210,54%,33%) 100%);
  color: hsl(210,100%,85%);
  border-top: 1px solid black;
  -moz-box-sizing: border-box;
}

#element-size {
  color: hsl(210,100%,95%);
}

#main {
  border-color: hsla(210,100%,85%,0.7);
  border-style: dotted;
}

#main > .border {
  color: hsl(210,53%,45%);
}

.border > span {
  background-color: hsl(210,100%,85%);
  border-radius: 2px;
  padding: 0 4px;
}

#content {
  border-color: hsla(210,100%,85%,0.7);
  border-style: dotted 
}

#padding {
  border-color: hsla(210,100%,85%,0.2);
  border-style: solid;
}

#borders {
  border-style: solid;
  border-color: hsl(210,100%,85%);
}

#togglebutton {
  background-image: url(layout-buttons.png);
  width: 16px;
  height: 16px;
}

body.open {
  background: url(layout-background-grid.png), -moz-radial-gradient(50% 70%, circle cover, hsl(210,53%,45%) 0%, hsl(210,54%,33%) 100%);
}

body.open > #header > #togglebutton {
  background-position: -16px 0;
}