gecko-dev/toolkit/content/aboutMozilla.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/. */

html {
  background: maroon radial-gradient( circle, #a01010 0%, #800000 80%) center center / cover no-repeat;
  color: white;
  font-style: italic;
  text-rendering: optimizeLegibility;
  min-height: 100%;
}

#moztext {
  margin-top: 15%;
  font-size: 1.1em;
  font-family: serif;
  text-align: center;
  line-height: 1.5;
}

#from {
  font-size: 1.95em;
  font-family: serif;
  text-align: end;
}

em {
  font-size: 1.3em;
  line-height: 0;
}

a {
  text-decoration: none;
  color: white;
}