.ac-device {
	background: url(../images/phone.png) no-repeat;
	width: 294px;
	height: 618px;
	margin: 0 auto;
	position: relative;
	background-size: 294px 618px;
	-webkit-transition: all 0.3s ease;
	-moz-transition: all 0.3s ease;
	transition: all 0.3s ease;
	-webkit-transform-style: preserve-3d;
	-moz-transform-style: preserve-3d;
	transform-style: preserve-3d;
}