chrome/renderer/resources/neterror.css

/* Copyright 2013 The Chromium Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file. */

/* Don't use the main frame div when the error is in a subframe. */
html[subframe] #main-frame-error {
  display: none;
}

/* Don't use the subframe error div when the error is in a main frame. */
html:not([subframe]) #sub-frame-error {
  display: none;
}

#diagnose-button {
  -webkit-margin-start: 0;
  float: none;
  margin-bottom: 10px;
  margin-top: 20px;
}

h1 {
  margin-top: 0;
}

h2 {
  color: #666;
  font-size: 1.2em;
  font-weight: normal;
  margin: 10px 0;
}

a {
  color: rgb(17, 85, 204);
  text-decoration: none;
}

.icon {
  -webkit-user-select: none;
}

.icon-generic {
  /**
   * Can't access chrome://theme/IDR_ERROR_NETWORK_GENERIC from an untrusted
   * renderer process, so embed the resource manually.
   */
  content: -webkit-image-set(
      url('default_100_percent/common/error_network_generic.png') 1x,
      url('default_200_percent/common/error_network_generic.png') 2x);
  height: 50px;
  padding-top: 20px;
  width: 41px;
}

.icon-offline {
  content: -webkit-image-set(
      url('default_100_percent/offline/100-error-offline.png') 1x,
      url('default_200_percent/offline/200-error-offline.png') 2x);
  height: 47px;
  margin: 0 0 40px;
  position: relative;
  width: 44px;
}

#content-top {
  margin: 20px;
}

#help-box-inner {
  background-color: #f9f9f9;
  border-top: 1px solid #EEE;
  color: #444;
  padding: 20px;
  text-align: start;
}

#suggestion {
  margin-top: 15px;
}

#short-suggestion {
  margin-top: 5px;
}

#sub-frame-error-details {
  color: #8F8F8F;
<if expr="not is_android and not is_ios">
  /* Not done on mobile for performance reasons. */
  text-shadow: 0 1px 0 rgba(255,255,255,0.3);
</if>
}

[jscontent=failedUrl] {
  overflow-wrap: break-word;
}

#search-container {
  /* Prevents a space between controls. */
  display: flex;
  margin-top: 20px;
}

#search-box {
  border: 1px solid #cdcdcd;
  flex-grow: 1;
  font-size: 16px;
  height: 26px;
  margin-right: 0;
  padding: 1px 9px;
}

#search-box:focus {
  border: 1px solid rgb(93, 154, 255);
  outline: none;
}

#search-button {
  border: none;
  border-bottom-left-radius: 0;
  border-top-left-radius: 0;
  box-shadow: none;
  display: flex;
  height: 30px;
  margin: 0;
  padding: 0;
  width: 60px;
}

#search-image {
  content:
      -webkit-image-set(
          url('../../app/theme/default_100_percent/common/omnibox_search_button_loupe.png') 1x,
          url('../../app/theme/default_200_percent/common/omnibox_search_button_loupe.png') 2x);
  margin: auto;
}

.hidden {
  display: none;
}

.suggestions {
  margin-top: 18px;
}

.suggestion-header {
  font-weight: bold;
  margin-bottom: 4px;
}

.suggestion-body {
  color: #777;
}

.error-code {
  color: #A0A0A0;
  margin-top: 15px;
}

/* Increase line height at higher resolutions. */
@media (min-width: 641px) and (min-height: 641px) {
  #help-box-inner {
    line-height: 18px;
  }
}

/* Decrease padding at low sizes. */
@media (max-width: 640px), (max-height: 640px) {
  body {
    margin: 15px;
  }
  h1 {
    margin: 10px 0 15px;
  }
  #content-top {
    margin: 15px;
  }
  #help-box-inner {
    padding: 20px;
  }
  .suggestions {
    margin-top: 10px;
  }
  .suggestion-header {
    margin-bottom: 0;
  }
  .error-code {
    margin-top: 10px;
  }
}

/* Don't allow overflow when in a subframe. */
html[subframe] body {
  overflow: hidden;
}

#sub-frame-error {
  -webkit-align-items: center;
  background-color: #DDD;
  display: -webkit-flex;
  -webkit-flex-flow: column;
  height: 100%;
  -webkit-justify-content: center;
  left: 0;
  position: absolute;
  top: 0;
  transition: background-color .2s ease-in-out;
  width: 100%;
}

#sub-frame-error:hover {
  background-color: #EEE;
}

#sub-frame-error .icon-generic {
  margin: 0 0 16px;
}

#sub-frame-error-details {
  margin: 0 10px;
  text-align: center;
  visibility: hidden;
}

/* Show details only when hovering. */
#sub-frame-error:hover #sub-frame-error-details {
  visibility: visible;
}

/* If the iframe is too small, always hide the error code. */
/* TODO(mmenke): See if overflow: no-display works better, once supported. */
@media (max-width: 200px), (max-height: 95px) {
  #sub-frame-error-details {
    display: none;
  }
}

/* Adjust icon for small embedded frames in apps. */
@media (max-height: 100px) {
  #sub-frame-error .icon-generic {
    height: auto;
    margin: 0;
    padding-top: 0;
    width: 25px;
  }
}

/* details-button is special; it's a <button> element that looks like a link. */
#details-button {
  background-color: inherit;
  background-image: none;
  border: none;
  box-shadow: none;
  min-width: 0;
  padding: 0;
  text-decoration: underline;
}

/* Styles for platform dependent separation of controls and details button. */
.suggested-left > #control-buttons,
.suggested-right > #details-button  {
  float: left;
}

.suggested-right > #control-buttons,
.suggested-left > #details-button  {
  float: right;
}

#details-button.singular {
  float: none;
}

#buttons::after {
  clear: both;
  content: '';
  display: block;
  width: 100%;
}

/* Offline page */
.offline .interstitial-wrapper {
  color: #2b2b2b;
  font-size: 1em;
  line-height: 1.55;
  margin: 100px auto 0;
  max-width: 600px;
  width: 100%;
}

.offline .runner-container {
  height: 150px;
  max-width: 600px;
  overflow: hidden;
  position: absolute;
  top: 10px;
  width: 44px;
  z-index: 2;
}

.offline .runner-canvas {
  height: 150px;
  max-width: 600px;
  opacity: 1;
  overflow: hidden;
  position: absolute;
  top: 0;
}

.offline .controller {
  background: rgba(247,247,247, .1);
  height: 100vh;
  left: 0;
  position: absolute;
  top: 0;
  width: 100vw;
  z-index: 1;
}

#offline-resources {
  display: none;
}

@media (max-width: 400px) {
  .suggested-left > #control-buttons,
  .suggested-right > #control-buttons {
    float: none;
    margin: 50px 0 20px;
  }
}

@media (max-height: 350px) {
  h1 {
    margin: 0 0 15px;
  }

  .icon-offline {
    margin: 0 0 10px;
  }

  .interstitial-wrapper {
    margin-top: 5%;
  }

  .nav-wrapper {
    margin-top: 30px;
  }
}