WordPress/wp-includes/css/customize-loader.dev.css

body.customize-active {
	overflow: hidden;
}

#customize-container {
	display: none;
	background: #fff;
	z-index: 500000;
	position: fixed;
	top: 0;
	bottom: 0;
	left: 0;
	right: 0;
}

.customize-active #customize-container {
	display: block;
}

#customize-container.collapsed {
	left: -302px;
}

#customize-container iframe {
	height: 100%;
	width: 100%;
	z-index: 20;
}

#customize-container .collapse-sidebar,
#customize-container .return-to-admin {
	z-index: 50;
	position: absolute;
	text-decoration: none;
}

#customize-container .return-to-admin {
	top: 15px;
	left: 20px;
}

/* Collapse Button */
#customize-container .collapse-sidebar {
	position: absolute;
	top: 13px;
	left: 265px;
	z-index: 50;
	display: block;
	width: 19px;
	height: 19px;
	padding: 0;
	border-radius: 50%;
}
#customize-container.collapsed .collapse-sidebar {
	position: absolute;
	left: 315px;
}
#customize-container .collapse-sidebar span {
	margin-top: 2px;
	margin-left: 2px;
	display: block;
	width: 15px;
	height: 15px;
	background: transparent url('../../wp-admin/images/arrows.png') no-repeat 0 -72px;
}
#customize-container.collapsed .collapse-sidebar span {
	background-position: 0 -108px;
}

/* Animations */
#customize-container,
#customize-container .collapse-sidebar {
	-moz-transition-property: left, right, top, bottom;
	-webkit-transition-property: left, right, top, bottom;
	-o-transition-property: left, right, top, bottom;
	-ms-transition-property: left, right, top, bottom;
	transition-property: left, right, top, bottom;
	-moz-transition-duration: 0.2s;
	-webkit-transition-duration: 0.2s;
	-o-transition-duration: 0.2s;
	-ms-transition-duration: 0.2s;
	transition-duration: 0.2s;
}