gecko-dev/browser/metro/theme/config.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,
body {
    margin: 0;
    padding: 0;
    background-color: #ced7de;
    -moz-user-select: none;
    font-family: "Segoe UI", sans-serif;
    -moz-text-size-adjust: none;
}

.toolbar {
    width: 100%;
    height: 3em;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 10;
    box-shadow: 0 0 3px #444;
    background-color: #ced7de;
    color: #000000;
    font-weight: bold;
    border-bottom: 2px solid;
    -moz-border-bottom-colors: #ff9100 #f27900;
}

.toolbar-container {
    max-width: 40em;
    margin-left: auto;
    margin-right: auto;
}

#filter-container {
    margin-top: 0.5em;
    margin-bottom: 0.5em;
    margin-right: 0.5em;
    height: 2em;
    border: 1px solid transparent;
    border-image-source: url("chrome://browser/skin/images/textfield.png");
    border-image-slice: 1 1 3 1;
    border-image-width: 1px 1px 3px 1px;
    overflow: hidden;
    display: flex;
    flex-direction: row;
}

#filter-input {
    -moz-appearance: none;
    border: none;
    background-image: none;
    background-color: transparent;
    display: inline-block;
    width: 12em;
    min-width: 0;
    color: #000000;
    opacity: 1;
    flex: 1 1 main-size;
}

#filter-input:-moz-placeholder {
    color: rgba(255,255,255,0.5);
}

.toolbar input {
    display: inline-block;
    height: 100%;
    min-width: 3em;
    box-sizing: border-box;
    opacity: 0.75;
}

#new-pref-toggle-button {
    background-position: center center;
    background-image: url("chrome://browser/skin/images/reader-plus-icon-xhdpi.png");
    background-size: 48px 48px;
    height: 48px;
    width: 48px;
    display: inline-block;
    outline-style: none;
}

#filter-search-button {
    background-image: url("chrome://browser/skin/images/search.png");
    background-size: 32px 32px;
    height: 32px;
    width: 32px;
    display: inline-block;
    outline-style: none;
}

#filter-input-clear-button {
    background-image: url("chrome://browser/skin/images/search-clear-30.png");
    background-size: 32px 32px;
    height: 32px;
    width: 32px;
    display: inline-block;
    outline-style: none;
}

#filter-input[value=""] + #filter-input-clear-button {
    display: none;
}

.toolbar-item {
    display: inline-block;
    height: 3em;
    min-width: 3em;
    float: right;
}

#content {
    position: relative;
    margin: 0;
    margin-left: auto;
    margin-right: auto;
    padding-top: 3em;
    padding-left: 0;
    padding-right: 0;
    min-height: 100%;
    max-width: 40em;
}

ul {
    list-style-position: inside;
    border: 1px solid #808080;
    background-color: #ffffff;
    min-height: 100%;
    width: 100%;
    padding-top: 0;
    margin: 0;
    padding-left: 0;
    box-sizing: border-box;
    box-shadow: 0 0 5px #000000;
    overflow-x: hidden;
}

#new-pref-container {
    width: 100%;
    margin: 0;
    background-color: #ffffff;
    box-sizing: border-box;
    box-shadow: 0 0 5px #000000;
    overflow-x: hidden;
    max-width: 40em;
    max-height: 100%;
    position: fixed;
    top: 3em;
    left: auto;
    display: none;
    z-index: 5;
}

#new-pref-container input,
#new-pref-container select {
    border: none;
    background-image: none;
}

#new-pref-container.show {
    display: block;
}

li {
    list-style-type: none;
    border-bottom: 1px solid #d3d3d3;
    opacity: 1;
    background-color: #ffffff;
    cursor: pointer;
}

#new-pref-line-boolean,
#new-pref-value-string,
#new-pref-value-int {
    display: none;
}
#new-pref-item[typestyle="boolean"] #new-pref-line-boolean,
#new-pref-item[typestyle="string"] #new-pref-value-string,
#new-pref-item[typestyle="int"] #new-pref-value-int {
    display: block;
}

.pref-name,
.pref-value {
    padding: 15px 10px;
    text-align: left;
    text-overflow: ellipsis;
    overflow: hidden;
    background-image: none;
}

.pref-value {
    color: rgba(0,0,0,0.5);
    flex: 1 1 main-size;
    border: none;
    -moz-appearance: none;
    background-image: none;
    background-color: transparent;
}

.pref-name[locked] {
    padding-right: 20px;
    background-image: url("chrome://browser/skin/images/lock.png");
    background-repeat: no-repeat;
    background-position: right 50%;
    background-size: auto 60%;
}

#new-pref-name {
    width: 30em;
}

#new-pref-type {
    display: inline-block !important;
    border-left: 1px solid #d3d3d3;
    width: 10em;
    text-align: right;
}

.pref-item-line {
    border-top: 1px solid rgba(0,0,0,0.05);
    color: rgba(0,0,0,0.5);
    display: flex;
    flex-direction: row;
}

#new-pref-value-boolean {
    flex: 1 1 main-size;
}

/* Disable newPref dialog spinbuttons, use custom version from Android */
/* Filed Bug 962359 to enhance the default spinbutton style to be touch-friendly */
#new-pref-value-int {
    -moz-appearance: textfield;
}

#new-pref-container .pref-button.toggle {
    display: inline-block;
    opacity: 1;
    flex: 0 1 main-size;
    float: right;
}

#new-pref-container .pref-button.cancel,
#new-pref-container .pref-button.create {
    display: inline-block;
    opacity: 1;
    flex: 1 1 main-size;
}

.pref-item-line {
    pointer-events: none;
}

#new-pref-container .pref-item-line,
.pref-item.selected .pref-item-line,
.pref-item:not(.selected) .pref-button.reset {
    pointer-events: auto;
}

#new-pref-container .pref-button.create[disabled] {
    color: #d3d3d3;
}

.pref-item.selected {
    background-color: rgba(0,0,255,0.05);
}

.pref-button {
    display: inline-block;
    box-sizing: border-box;
    text-align: center;
    padding: 10px 1em;
    border-left: 1px solid rgba(0,0,0,0.1);
    opacity: 0;
    transition-property: opacity;
    transition-duration: 500ms;
}

.pref-item.selected .pref-item-line .pref-button {
    opacity: 1;
}

.pref-item:not(.selected) .pref-item-line .pref-button:not(.reset) {
    display: none;
}

.pref-item:not(.selected) .pref-button.reset {
    opacity: 1;
}

/* Disable detail list item spinbuttons, use custom version from Android */
/* Filed Bug 962359 to enhance the default spinbutton style to be touch-friendly */
.pref-item input[type="number"] {
    -moz-appearance: textfield;
}

.pref-button:active {
    background-color: rgba(0,0,255,0.2);
}

.pref-button[disabled] {
    display: none;
}

.pref-button.up {
    background-image: url("chrome://browser/skin/images/arrowup-16.png");
    background-position: center center;
    background-repeat: no-repeat;
}

.pref-button.down {
    background-image: url("chrome://browser/skin/images/arrowdown-16.png");
    background-position: center center;
    background-repeat: no-repeat;
}

#prefs-shield {
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    position: fixed;
    top: 0;
    left: 0;
    opacity: 0;
    transition-property: opacity;
    transition-duration: 500ms;
    display: none;
}

#prefs-shield[shown] {
    display: block;
    opacity: 1;
}

#loading-container > li {
    background-image: url(chrome://global/skin/media/throbber.png);
    background-position: center center;
    background-repeat: no-repeat;
    padding-left: 40px;
    height: 3em;
    width: 100%;
}