chrome/browser/resources/enhanced_bookmark_manager/css/bmm.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. */

html,
body {
  cursor: default;
  height: 100%;
  margin: 0;
  overflow: hidden;
  width: 100%;
}

body {
  -webkit-flex-direction: column;
  display: -webkit-flex;
}

list {
  display: block;
  overflow-x: hidden;
  overflow-y: visible; /* let the container do the scrolling */
}

list > * {
  -webkit-padding-end: 20px;
  -webkit-padding-start: 3px;
  color: hsl(0, 0%, 70%);
  display: -webkit-flex;
  line-height: 20px;
  margin: 0;
  overflow: visible;
  padding-bottom: 0;
  padding-top: 0;
  text-decoration: none;
  white-space: nowrap;
}

list > * > * {
  -webkit-padding-start: 20px;
  background: 0 50% no-repeat;
  box-sizing: border-box;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: pre; /* Don't collapse whitespace */
}

list > * > .label {
  -webkit-transition: all 150ms;
  color: black;
  display: inline-block; /* We need to use inline-block here due to RTL. */
}

list > * > .url {
  -webkit-flex: 1;
  direction: ltr; /* URLs always read LTR */
  display: none;
  /* TODO(arv): Remove min-width once bug is fixed:
   * https://bugs.webkit.org/show_bug.cgi?id=111790 */
  min-width: 0;
}

list > :hover > .url,
list > [selected] > .url {
  display: block;
}

/* Handle proper padding for URL field in an RTL context, where field order is
 * |div.url||div.label| - so we need padding at the right of URL, not at the
 * left. And since url is always LTR, that is padding at the end, not the start.
 */
html[dir=rtl] .url {
  -webkit-padding-end: 20px;
  -webkit-padding-start: 0;
}

html[dir=rtl] list .label {
  background-position: 100% 50%;
}

list > .folder > .label {
  background-image: -webkit-image-set(
      url('../../../../../ui/resources/default_100_percent/common/folder_closed.png') 1x,
      url('../../../../../ui/resources/default_200_percent/common/folder_closed.png') 2x);
}

/* We need to ensure that even empty labels take up space */
list > * > .label:empty::after,
list > * > .url:empty::after {
  content: ' ';
  white-space: pre;
}

list > .folder > .url:empty::after {
  content: '';
}

list > * > button {
  -webkit-transition: opacity 150ms;
  background: #fff -webkit-canvas(drop-down-arrow) no-repeat center center;
  border: 1px solid hsl(214, 91%, 85%);
  border-radius: 3px;
  bottom: 1px;
  display: none;
  overflow: hidden;
  padding: 0;
  position: absolute;
  right: 3px;
  top: 1px;
  width: 15px;
}

list > [selected]:hover > button,
list > * > button[menu-shown] {
  border-color: hsl(214, 91%, 65%);
}

list > :hover > button {
  display: block;
}

list > * > button:hover,
list > * > button[menu-shown] {
  display: block;
}

html[dir=rtl] list > * > button {
  left: 3px;
  right: auto;
}

/* Edit mode */

list [editing] .label input,
list [editing] .url input {
  -webkit-margin-end: 4px;
  -webkit-margin-start: -4px;
  -webkit-padding-end: 3px;
  -webkit-padding-start: 3px;
  box-sizing: content-box;
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  /* Do not inherit the line-height. */
  line-height: normal;
  margin-bottom: 0;
  margin-top: 0;
  min-height: 0;
  text-decoration: none;
  vertical-align: baseline;
}

.tree-item [editing] input {
  line-height: normal;
  margin: 0;
  min-height: 0;
  padding: 1px 0;
}

<if expr="is_macosx">
list .label input,
list .url input {
  outline: none;
}
</if>

list > [editing] {
  overflow: visible;
}

list [editing] .label,
list [editing] .url,
list [editing] > * {
  overflow: visible;
}

list [editing] .url {
  -webkit-padding-start: 5px;
}

list [editing] input {
  padding: 1px 0;
}

/* end editing */

html[dir=rtl] list > .folder > .label {
  background-image: -webkit-image-set(
      url('../../../../../ui/resources/default_100_percent/common/folder_closed_rtl.png') 1x,
      url('../../../../../ui/resources/default_200_percent/common/folder_closed_rtl.png') 2x);
}

<if expr="is_macosx">
list > .folder > .label,
.tree-label,
.tree-row[may-have-children] > .tree-label,
.tree-item[expanded] > .tree-row > .tree-label {
  background-image: -webkit-image-set(
      url('../../../../app/theme/default_100_percent/mac/bookmark_bar_folder.png') 1x,
      url('../../../../app/theme/default_200_percent/mac/bookmark_bar_folder.png') 2x);
}
</if>

.main {
  -webkit-flex: 1;
  display: -webkit-flex;
  /* TODO(arv): Remove min-height once bug is fixed:
   * https://bugs.webkit.org/show_bug.cgi?id=111790 */
  min-height: 0;
}

#tree-container {
  -webkit-padding-end: 5px;
  -webkit-padding-start: 10px;
  box-sizing: border-box;
  /* min-width and max-width are used by the split pane. */
  max-width: 50%;
  min-width: 50px;
  overflow: auto;
  padding-bottom: 5px;
  padding-top: 5px;
  width: 200px;
}

#tree {
  display: inline-block;
  min-width: 100%;
  overflow: visible; /* let the container do the scrolling */
}

.tree-item > .tree-row {
  line-height: 20px;
}

.tree-row .expand-icon {
  top: 2px;
}

#list {
  -webkit-flex: 1;
  -webkit-padding-end: 5px;
  box-sizing: border-box;
  /* TODO(arv): Remove min-width once bug is fixed:
   * https://bugs.webkit.org/show_bug.cgi?id=111790 */
  min-width: 0;
  padding-bottom: 5px;
  padding-top: 5px;
}

.splitter {
  -webkit-border-end: 15px solid white;
  -webkit-border-start: 0;
  background-color: rgb(235, 239, 249);
  cursor: e-resize;
  width: 5px;
<if expr="is_macosx">
  cursor: col-resize;
</if>
}

.logo {
  -webkit-appearance: none;
  background: url('../images/bookmarks_section_32.png') no-repeat 50% 50%;
  border: 0;
  cursor: pointer;
  float: left;
  height: 32px;
  margin: 10px;
  width: 32px;
}

html:not(.focus-outline-visible) .logo:focus {
  outline: none;
}

.header form {
  float: left;
  margin: 14px 2px 0 2px;
  width: 171px;
}

.header {
  min-width: 400px;
}

html[dir=rtl] .logo,
html[dir=rtl] .header > div,
html[dir=rtl] .header form {
  float: right;
}

.tree-row.drag-on,
.drag-on {
  background-color: hsla(214, 91%, 85%, .5);
  border: 1px solid hsl(214, 91%, 85%);
  border-radius: 3px;
  box-sizing: border-box;
}

.drag-above::before,
.drag-below::after {
  background-clip: padding-box;
  background-color: black;
  border: 3px solid black;
  border-bottom-color: transparent;
  border-radius: 0;
  border-top-color: transparent;
  box-sizing: border-box;
  content: '';
  display: block;
  height: 8px;
  left: 0;
  position: absolute;
  right: 0;
  z-index: 10;
}

.drag-above::before {
  top: calc((8px/2 + 1px) * -1)
}

.drag-below::after {
  bottom: calc((8px/2 + 1px) * -1)
}

list.drag-above::before {
  top: 0
}

list > .drag-below,
list > .drag-above {
  overflow : visible;
}

.summary {
  background-color: rgb(235, 239, 249);
  border-top: 1px solid rgb(156, 194, 239);
  clear: both;
  padding: 5px 10px;
  white-space: nowrap;
}

.summary > * {
  display: inline-block;
  font-size: 100%;
  margin: 0;
}

.summary button {
  -webkit-appearance: none;
  -webkit-margin-start: 10px;
  -webkit-padding-end: 11px;
  -webkit-padding-start: 0;
  background: transparent -webkit-canvas(drop-down-arrow)
              no-repeat right center;
  border: 0;
  font: inherit;
  padding-bottom: 0;
  padding-top: 0;
}

html[dir=rtl] .summary button {
  background-position: left center;
}

@media (pointer:coarse) {
  list > *,
  menu > button,
  .tree-item > .tree-row {
    line-height: 28px;
  }

  list [editing] input,
  .tree-item [editing] input {
    padding: 3px 0;
  }

  .tree-row .expand-icon {
    top: 6px;
  }
}