WordPress/wp-admin/css/widgets.css

/* 2 column liquid layout */
div.widget-liquid-left-holder {
	float: left;
	clear: left;
	width: 100%;
	margin-right: -310px;
}

div.widget-liquid-left {
	margin-right: 320px;
}

div.widget-liquid-right {
	float: right;
	clear: right;
	width: 300px;
	position: relative;
}

/* pasitioning etc. */
form#widgets-filter {
	position: relative;
}

div#available-widgets-filter {
	border-bottom-width: 1px;
	border-bottom-style: solid;
}

p#widget-search {
	position: absolute;
	right: 0;
	top: 0;
	margin: 0;
}

ul#widget-list {
	list-style: none;
	margin: 0;
	padding: 0;
}

ul#widget-list li.widget-list-item {
	padding: .7em 0.9em;
	margin: 0;
	border-bottom-width: 1px;
	border-bottom-style: solid;
	line-height: 1;
}

h4.widget-title span {
	float: left;
}

h4.widget-title a {
	float: right;
	text-decoration: underline;
	border-bottom: none;
	margin-left: 1em;
}

ul#widget-list li.widget-list-item h4.widget-title {
	position: relative;
	margin: 0;
	padding: .5em 1em;
	width: 200px;
	float: left;
	font-size: 13px;
	-moz-border-radius: 3px;
	-khtml-border-radius: 3px;
	-webkit-border-radius: 3px;
	border-radius: 3px;
}

#dragHelper h4.widget-title {
	padding: .5em 1em;
	margin: 0;
}

ul#widget-list li.widget-list-item div.widget-description {
	display: block;
	margin: 0 0 0 200px;
	padding: 0 0 0 4em;
	font-size: 11px;
}

ul#widget-list li.widget-list-item ul.widget-control-info {
	display: none;
}

div#sidebar-info {
	padding: 0 1em;
	margin-bottom: 1em;
	font-size: 11px;
}

ul.widget-control-list {
	list-style: none;
	margin: 0;
	padding: 0 1em;
}

div#current-widgets p.submit {
	padding: 1em;
}

li.widget-list-control-item {
	margin: 1em 0;
	-moz-border-radius: 3px;
	-khtml-border-radius: 3px;
	-webkit-border-radius: 3px;
	border-radius: 3px;
}

li.widget-list-control-item h4, 
#dragHelper li.widget-list-control-item h4, 
li.widget-sortable h4 {
	margin: 0;
	cursor: move;
	font-size: 13px;
	padding: 0.4em 0.8em;
	position: relative;
	-moz-border-radius: 3px;
	-khtml-border-radius: 3px;
	-webkit-border-radius: 3px;
	border-radius: 3px;
}

.widget-control-save, .widget-control-remove {
	padding: 3px 5px;
	-moz-border-radius: 3px;
	-khtml-border-radius: 3px;
	-webkit-border-radius: 3px;
	border-radius: 3px;
	margin-right: 8px;
	float: left;
	text-decoration: none;
}

li.widget-list-control-item h4.widget-title a,
#dragHelper li.widget-list-control-item h4.widget-title a,
#draghelper li.widget-list-control-item h4.widget-title a:visited {
	right: 1em;
}

li.widget-list-control-item h4.widget-title a:hover {
	text-decoration: none;
	border-bottom: none;
}

li.widget-list-control-item div.widget-control {
	display: none;
	padding: 15px;
	font-size: 11px;
	position: relative;
}

li.widget-list-control-item div.widget-control p {
	margin: 0 0 1em;
	padding: 0;
}

ul.widget-control-list div.widget-control-actions {
	border-top-width: 1px;
	border-top-style: solid;
	padding: 0.5em 0 0;
}

.widget-control-edit {
	font-size: 10px;
	font-weight: normal;
}

div#current-widgets {
	padding-top: 1em;
	border-width: 1px;
	border-style: solid none none;
}

#widget-controls .widefat {
	width: 92%;
	padding: 3px;
}

#widget-controls select.widefat {
	width: auto;
	display: block;
}