gecko-dev/browser/devtools/layoutview/view.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, html {
  height: 100%;
  width: 100%;
  overflow: hidden;
}

body {
  margin: 0;
  padding: 0;
}

#header {
  box-sizing: border-box;
  width: 100%;
  padding: 6px 9px;
  display: -moz-box;
  vertical-align: top;
}

#header:-moz-dir(rtl) {
  -moz-box-direction: reverse;
}

#header > span {
  display: -moz-box;
}

#element-size {
  -moz-box-flex: 1;
}

#element-size:-moz-dir(rtl) {
  -moz-box-pack: end;
}

#main {
  margin: 0 10px 10px 10px;
  box-sizing: border-box;
  width: calc(100% - 2 * 10px);
  position: absolute;
  border-width: 1px;
}

@media (min-width: 320px) {
  body {
    position: absolute;
    width: 320px;
    left: -160px;
    margin-left: 50%;
  }
}

#content,
#borders {
  border-width: 1px;
}

#content {
  height: 25px;
}

#margins,
#padding {
  border-style: solid;
  border-width: 25px;
}

#borders {
  padding: 25px;
}

#main > p {
  position: absolute;
  pointer-events: none;
}

#main > p {
  margin: 0;
  text-align: center;
}

#main > p > span {
  vertical-align: middle;
  pointer-events: auto;
  cursor: default;
}

.top,
.bottom {
  width: calc(100% - 2px);
  text-align: center;
}

.padding.top {
  top: 55px;
}

.padding.bottom {
  bottom: 57px;
}

.border.top {
  top: 30px;
}

.border.bottom {
  bottom: 31px;
}

.margin.top {
  top: 5px;
}

.margin.bottom {
  bottom: 6px;
}

.size,
.margin.left,
.margin.right,
.border.left,
.border.right,
.padding.left,
.padding.right {
  top: 22px;
  line-height: 132px;
}

.size {
  width: calc(100% - 2px);
}

.margin.right,
.margin.left,
.border.left,
.border.right,
.padding.right,
.padding.left {
  width: 25px;
}

.padding.left {
  left: 52px;
}

.padding.right {
  right: 51px;
}

.border.left {
  left: 26px;
}

.border.right {
  right: 26px;
}

.margin.right {
  right: 0;
}

.margin.left {
  left: 0;
}

.tooltip {
  position: absolute;
  bottom: 0;
  right: 2px;
  pointer-events: none;
}

body.dim > #header > #element-position,
body.dim > #main > p,
body.dim > #main > .tooltip {
  visibility: hidden;
}