WordPress/wp-admin/css/forms.css

/* include margin and padding in the width calculation of input and textarea */
input,
input[type="text"],
input[type="password"],
input[type="number"],
input[type="search"],
input[type="email"],
input[type="url"],
textarea {
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
}

input[type="checkbox"],
input[type="radio"] {
	border: 1px solid #bbb;
	background: #fff;
	color: #555;
	clear: none;
	cursor: pointer;
	display: inline-block;
	line-height: 0;
	height: 16px;
	margin: -4px 4px 0 0;
	outline: 0;
	padding: 0 !important;
	text-align: center;
	vertical-align: middle;
	width: 16px;
	min-width: 16px;
	-webkit-appearance: none;
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
	-webkit-box-shadow: inset 0 1px 2px rgba(0,0,0,0.1);
	box-shadow: inset 0 1px 2px rgba(0,0,0,0.1);
}

input[type="radio"]:checked + label:before {
	color: #888;
}

.wp-core-ui input[type="reset"]:hover,
.wp-core-ui input[type="reset"]:active {
	color: #2ea2cc;
}

td > input[type="checkbox"],
.wp-admin p input[type=checkbox],
.wp-admin p input[type=radio] {
	margin-top: 0;
}

.wp-admin p label input[type=checkbox] {
	margin-top: -4px;
}

.wp-admin p label input[type=radio] {
	margin-top: -2px;
}

input[type=radio] {
	-webkit-border-radius: 50%;
	border-radius: 50%;
	margin-right: 4px;
	line-height: 10px;
}

input:disabled,
input.disabled,
textarea:disabled,
textarea.disabled {
	-webkit-box-shadow: inset 0 1px 2px rgba(0,0,0,0.04);
	box-shadow: inset 0 1px 2px rgba(0,0,0,0.04);
	border-color: rgba(222, 222, 222, .75);
	background: rgba(255, 255, 255, .5);
	color: rgba(51, 51, 51, .5);
}

input[type=checkbox]:disabled,
input[type=radio]:disabled,
input[type=checkbox]:disabled:checked:before,
input[type=radio]:disabled:checked:before {
	opacity: 0.7;
}

input[type=checkbox]:checked:before,
input[type=radio]:checked:before {
	float: left;
	display: inline-block;
	vertical-align: middle;
	width: 16px;
	font: normal 21px/1 'dashicons';
	speak: none;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

input[type=checkbox]:checked:before {
	content: '\f147';
	margin: -3px 0 0 -4px;
	color: #1e8cbe;
}

input[type=radio]:checked:before {
	content: '\2022';
	text-indent: -9999px;
	-webkit-border-radius: 50px;
	border-radius: 50px;
	font-size: 24px;
	width: 6px;
	height: 6px;
	margin: 4px;
	line-height: 16px;
	background-color: #1e8cbe;
}

input.readonly, textarea.readonly {
	background-color: #ddd;
}

@-moz-document url-prefix() {
	input[type=checkbox],
	input[type=radio],
	.form-table input.tog {
		margin-bottom: -1px;
	}
}

/* Search */
input[type="search"] {
	-webkit-appearance: textfield;
}

input[type="search"]::-webkit-search-decoration {
	display: none;
}

.ie8 input[type="password"] {
	font-family: sans-serif;
}

textarea,
input,
select,
button {
	font-family: inherit;
	font-size: inherit;
	font-weight: inherit;
}

textarea,
input,
select {
	font-size: 14px;
	padding: 3px 5px;
	line-height: 15px;
	-webkit-border-radius: 0;
	border-radius: 0; /* Reset mobile webkit's default element styling */
}

textarea {
	overflow: auto;
	padding: 2px 6px;
	line-height: 1.4;
}

input[type="text"],
input[type="password"],
input[type="number"],
input[type="search"],
input[type="email"],
input[type="url"],
textarea,
select {
	outline: 0;
}

.wp-admin input[type="file"] {
	padding: 3px 0;
}

label {
	cursor: pointer;
}

input,
select {
	margin: 1px;
	padding: 3px 5px;
}

input.code {
	padding-top: 6px;
}

textarea.code {
	line-height: 1.4;
	padding: 4px 6px 1px 6px;
}

textarea,
input[type="text"],
input[type="password"],
input[type="email"],
input[type="number"],
input[type="search"],
input[type="tel"],
input[type="url"],
select {
	border: 1px solid #ddd;
	-webkit-box-shadow: inset 0 1px 2px rgba(0,0,0,0.07);
	box-shadow: inset 0 1px 2px rgba(0,0,0,0.07);
	background-color: #fff;
	color: #333;
}

select[disabled] {
	color: #7f7f7f;
}

select:focus {
	border-color: #aaa;
}

textarea:focus,
input[type="text"]:focus,
input[type="password"]:focus,
input[type="email"]:focus,
input[type="number"]:focus,
input[type="search"]:focus,
input[type="tel"]:focus,
input[type="url"]:focus,
input[type="checkbox"]:focus,
input[type="radio"]:focus,
select:focus {
	border-color: #999;
	-webkit-box-shadow: 0 1px 2px rgba(0,0,0,0.1);
	box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

input[readonly] {
	background-color: #eee;
}

:-moz-placeholder,
.wp-core-ui :-moz-placeholder {
   color: #a9a9a9;
}

.form-invalid {
	background-color: #ffebe8 !important;
}

.form-invalid input,
.form-invalid select {
	border-color: #c00 !important;
}

.form-input-tip {
	color: #666;
}

/*------------------------------------------------------------------------------
  2.0 - Forms
------------------------------------------------------------------------------*/


.wp-admin select {
	padding: 2px;
	line-height: 28px;
	height: 28px;
	vertical-align: middle;
}

.wp-admin .button-cancel {
	padding: 0 5px;
	line-height: 2;
}

.meta-box-sortables select {
	max-width: 100%;
}

.wp-admin select[multiple] {
	height: auto;
}

.submit {
	padding: 1.5em 0;
	margin: 5px 0;
	-webkit-border-bottom-left-radius: 3px;
	border-bottom-left-radius: 3px;
	-webkit-border-bottom-right-radius: 3px;
	border-bottom-right-radius: 3px;
	border: none;
}

form p.submit a.cancel:hover {
	text-decoration: none;
}

p.submit {
	text-align: left;
	max-width: 100%;
	margin-top: 20px;
	padding-top: 10px;
}

.textright p.submit {
	border: none;
	text-align: right;
}

table.form-table + p.submit,
table.form-table + input + p.submit,
table.form-table + input + input + p.submit {
	border-top: none;
	padding-top: 0;
}

#minor-publishing-actions input,
#major-publishing-actions input,
#minor-publishing-actions .preview {
	text-align: center;
}

textarea.all-options,
input.all-options {
	width: 250px;
}

input.large-text,
textarea.large-text {
	width: 99%;
}

input.regular-text,
#adduser .form-field input {
	width: 25em;
}

input.small-text {
	width: 50px;
	padding: 1px 6px;
}

input[type="number"].small-text {
	width: 65px;
}

#doaction,
#doaction2,
#post-query-submit {
	margin: 1px 8px 0 0;
}

.tablenav #changeit,
.tablenav #delete_all,
.tablenav #clear-recent-list {
	margin-top: 1px;
}

.tablenav .actions select {
	float: left;
	margin-right: 6px;
	max-width: 200px;
}

.ie8 .tablenav .actions select {
	width: 155px;
}

.ie8 .tablenav .actions select#cat {
	width: 200px;
}

#timezone_string option {
	margin-left: 1em;
}

#upload-form label {
	color: #777;
}

label,
#your-profile label + a {
	vertical-align: middle;
}

fieldset label,
#your-profile label + a {
	vertical-align: middle;
}

.options-media-php label[for*="_size_"],
#misc-publishing-actions label {
	vertical-align: baseline;
}

#misc-publishing-actions label[for="post_status"]:before {
	content: '\f173';
	display: inline-block;
	font: normal 20px/1 'dashicons';
	speak: none;
	left: -1px;
	padding: 0 5px 0 0;
	position: relative;
	top: 0;
	text-decoration: none !important;
	vertical-align: top;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

#pass-strength-result {
	background-color: #eee;
	border: 1px solid #ddd;
	float: left;
	margin: 13px 5px 5px 1px;
	padding: 3px 5px;
	text-align: center;
	width: 200px;
	display: none;
}

#pass-strength-result.short {
	background-color: #ffa0a0;
	border-color: #f04040;
}

#pass-strength-result.bad {
	background-color: #ffb78c;
	border-color: #ff853c;
}

#pass-strength-result.good {
	background-color: #ffec8b;
	border-color: #fc0;
}

#pass-strength-result.strong {
	background-color: #c3ff88;
	border-color: #8dff1c;
}

.indicator-hint {
	padding-top: 8px;
}

p.search-box {
	float: right;
	margin: 0;
}

.network-admin.themes-php p.search-box {
	clear: left;
}

.search-box input[name="s"],
#search-plugins input[name="s"],
.tagsdiv .newtag {
	float: left;
	height: 28px;
	margin: 0 4px 0 0;
}

input[type="text"].ui-autocomplete-loading {
	background: transparent url('../images/loading.gif') no-repeat right center;
	visibility: visible;
}

ul#add-to-blog-users {
	margin: 0 0 0 14px;
}

.ui-autocomplete-input.open {
	-webkit-border-bottom-right-radius: 0;
	border-bottom-right-radius: 0;
	-webkit-border-bottom-left-radius: 0;
	border-bottom-left-radius: 0;
}

.ui-autocomplete {
	padding: 0;
	margin: 0;
	list-style: none;
	position: absolute;
	z-index: 10000;
	-webkit-border-bottom-right-radius: 3px;
	border-bottom-right-radius: 3px;
	-webkit-border-bottom-left-radius: 3px;
	border-bottom-left-radius: 3px;
	border: 1px solid #aaa;
	background-color: #efefef;
}

.ui-autocomplete li {
	margin-bottom: 0;
	white-space: nowrap;
	text-align: left;
}

.ui-autocomplete li a {
	display: block;
	height: 100%;
	padding: 4px 10px;
	color: #444;
}

.ui-autocomplete li a.ui-state-focus {
	background-color: #ddd;
	cursor: pointer;
}

/*------------------------------------------------------------------------------
  15.0 - Comments Screen
------------------------------------------------------------------------------*/

.form-table {
	border-collapse: collapse;
	margin-top: 0.5em;
	width: 100%;
	clear: both;
}

.form-table,
.form-table td,
.form-table th,
.form-table td p,
.form-wrap label {
	font-size: 14px;
}

.form-table td {
	margin-bottom: 9px;
	padding: 15px 10px;
	line-height: 1.3;
	vertical-align: middle;
}

.form-table th,
.form-wrap label {
	color: #222;
	font-weight: normal;
	text-shadow: none;
	vertical-align: baseline;
}

.form-table th {
	vertical-align: top;
	text-align: left;
	padding: 20px 10px 20px 0;
	width: 200px;
	line-height: 1.3;
	font-weight: 600;
}

.form-table th.th-full {
	width: auto;
	font-weight: 400;
}

.form-table td p {
	margin-top: 4px;
	margin-bottom: 0;
}

.form-table td fieldset label {
	margin: 0.25em 0 0.5em !important;
	display: inline-block;
}

.form-table td fieldset label,
.form-table td fieldset p,
.form-table td fieldset li {
	line-height: 1.4em;
}

.form-table input.tog,
.form-table input[type=radio] {
	margin-top: -4px;
	margin-right: 4px;
	float: none;
}

.form-table .pre {
	padding: 8px;
	margin: 0;
}

table.form-table td .updated {
	font-size: 13px;
}

/*------------------------------------------------------------------------------
  18.0 - Users
------------------------------------------------------------------------------*/

#profile-page .form-table textarea {
	width: 500px;
	margin-bottom: 6px;
}

#profile-page .form-table #rich_editing {
	margin-right: 5px
}

#your-profile legend {
	font-size: 22px;
}

#display_name {
	width: 15em;
}

#createuser .form-field input {
	width: 25em;
}

.color-option {
	display: inline-block;
	width: 24%;
	padding: 5px 15px 15px;
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
	margin-bottom: 3px;
}

.color-option:hover,
.color-option.selected {
	background: #ddd;
}

.color-palette {
	width: 100%;
	border-spacing: 0;
	border-collapse: collapse;
}
.color-palette td {
	height: 20px;
	padding: 0;
	border: none;
}

.color-option {
	cursor: pointer;
}

/*------------------------------------------------------------------------------
  19.0 - Tools
------------------------------------------------------------------------------*/

.tool-box .title {
	margin: 8px 0;
	font-size: 18px;
	font-weight: normal;
	line-height: 24px;
}

.pressthis {
	margin: 20px 0;
}

.pressthis a,
.pressthis a:hover,
.pressthis a:focus,
.pressthis a:active {
	display: inline-block;
	position: relative;
	cursor: move;
	color: #333;
	background: #e6e6e6;
	-webkit-border-radius: 5px;
	border-radius: 5px;
	border: 1px solid #b4b4b4;
	font-style: normal;
	line-height: 16px;
	font-size: 14px;
	text-decoration: none;
}

.pressthis a:active {
	outline: none;
}

.pressthis a:hover:after {
	-webkit-transform: skew(20deg) rotate(9deg);
	-ms-transform: skew(20deg) rotate(9deg);
	transform: skew(20deg) rotate(9deg);
	-webkit-box-shadow: 0 10px 8px rgba(0, 0, 0, 0.7);
	box-shadow: 0 10px 8px rgba(0, 0, 0, 0.7);
}

.pressthis a span {
	display: inline-block;
	margin: 0px 0 0;
	padding: 0px 12px 8px 9px;
}

.pressthis a span:before {
	color: #777;
	font: normal 20px/1 'dashicons';
	content:'\f157';
	position: relative;
	display: inline-block;
	top: 4px;
	margin-right: 4px;
}

.pressthis a:after {
	content: '';
	width: 70%;
	height: 55%;
	z-index: -1;
	position: absolute;
	right: 10px;
	bottom: 9px;
	background: transparent;
	-webkit-transform: skew(20deg) rotate(6deg);
	-ms-transform: skew(20deg) rotate(6deg);
	transform: skew(20deg) rotate(6deg);
	-webkit-box-shadow: 0 10px 8px rgba(0, 0, 0, 0.6);
	box-shadow: 0 10px 8px rgba(0, 0, 0, 0.6);
}

/*------------------------------------------------------------------------------
  20.0 - Settings
------------------------------------------------------------------------------*/

#utc-time, #local-time {
	padding-left: 25px;
	font-style: italic;
}

.defaultavatarpicker .avatar {
	margin: 2px 0;
	vertical-align: middle;
}

.options-general-php .spinner {
	float: none;
	margin: -3px 3px;
}

/* =Media Queries
-------------------------------------------------------------- */

@media screen and ( max-width: 782px ) {
	/* Input Elements */
	textarea {
		-webkit-appearance: none;
	}

	input[type=text], input[type=search],
	input[type=password], input[type=number] {
		-webkit-appearance: none;
		padding: 6px 10px;
	}

	input.code {
		padding-bottom: 5px;
		padding-top: 10px;
	}

	input[type=checkbox], .widefat th input[type=checkbox] {
		-webkit-appearance: none;
		padding: 10px;
	}

	.widefat th input[type=checkbox] {
		margin-bottom: 8px;
	}

	input[type=checkbox]:checked:before, .widefat th input[type=checkbox]:before {
		font: normal 30px/1 'Dashicons';
		margin: -3px -5px;
	}

	input[type=radio],
	input[type=checkbox] {
		height: 25px;
		width: 25px;
	}

	.wp-admin p input[type=checkbox],
	.wp-admin p input[type=radio] {
		margin-top: -3px;
	}

	input[type=radio]:checked:before {
		vertical-align: middle;
		width: 9px;
		height: 9px;
		margin: 7px;
		line-height: 16px;
	}

	.wp-upload-form input[type=submit] {
		margin-top: 10px;
	}

	#wpbody select {
		height: 36px;
		font-size: 16px;
	}

	.wp-admin .button-cancel {
		padding: 0;
		font-size: 14px;
	}

	#createuser .form-field input {
		width: 100%;
	}

	.form-table {
		-webkit-box-sizing: border-box;
		-moz-box-sizing: border-box;
		box-sizing: border-box;
	}

	.form-table th,
	.form-table td {
		display: block;
		width: auto;
		vertical-align: middle;
	}

	.form-table .color-palette td {
		display: table-cell;
		width: 15px;
	}

	.form-table table.color-palette {
		margin-right: 10px;
	}

	textarea,
	input {
		font-size: 16px;
	}

	.form-table td input[type="text"],
	.form-table td input[type="password"],
	.form-table td select,
	.form-table td textarea,
	.form-table span.description,
	#profile-page .form-table textarea {
		width: 100%;
		font-size: 16px;
		line-height: 1.5;
		padding: 7px 10px;
		display: block;
		max-width: none;
		-webkit-box-sizing: border-box;
		-moz-box-sizing: border-box;
		box-sizing: border-box;
	}

	input[type=text].small-text,
	input[type=search].small-text,
	input[type=password].small-text,
	input[type=number].small-text,
	input[type="number"].small-text,
	.form-table input[type=text].small-text {
		width: auto;
		max-width: 55px;
		display: inline;
		padding: 3px 6px;
		margin: 0 3px;
	}

	#pass-strength-result {
		width: 100%;
		-webkit-box-sizing: border-box;
		-moz-box-sizing: border-box;
		box-sizing: border-box;
		padding: 8px;
	}

	p.search-box {
		float: none;
		position: absolute;
		bottom: 0;
		width: 98%;
		height: 90px;
		margin-bottom: 20px;
	}

	p.search-box input[name="s"] {
		height: auto;
		float: none;
		width: 100%;
		margin-bottom: 10px;
		vertical-align: middle;
		-webkit-appearance: none;
	}

	p.search-box input[type="submit"] {
		margin-bottom: 10px;
	}

	.form-table span.description {
		padding: 4px 0 0;
		line-height: 1.4em;
	}

	.form-table th {
		padding-top: 10px;
		padding-bottom: 0;
		border-bottom: 0;
	}

	.form-table td {
		padding-top: 8px;
		padding-left: 0;
	}

	.form-table input.regular-text {
		width: 100%;
	}

	.form-table label {
		font-size: 14px;
	}

	.form-table fieldset label {
		display: block;
	}

	#utc-time {
		margin-top: 10px;
	}

	#utc-time,
	#local-time {
		display: block;
		float: none;
		padding: 0;
		line-height: 2;
	}
}

@media only screen and (max-width: 768px) {
	.form-field input,
	.form-field textarea {
		width: 99%;
	}

	.form-wrap .form-field {
		padding:0;
	}

	/* users */
	#profile-page .form-table textarea {
		max-width: 400px;
		width: auto;
	}
}

/* Smartphone */
@media screen and (max-width: 600px) {
	/* Color Picker Options */
	.color-option {
		width: 49%;
	}
}