.demo {
	/*padding: 3em 0;*/
	margin-bottom: 1em;
}

.box {
	position: relative;
	/*  perspective: 1000px;*/
	border: 1px solid #c1c1c1;
    margin: 5px;
}

.box .box-img {
	transform: rotateY(0);
	transition: all 0.50s ease-in-out 0s;
}

.box:hover .box-img {
	transform: rotateY(-90deg);
}

.box .box-img img {
	/*width: 100%;原有属性*/
	width: 100%;
	height: auto;
}

.box .box-content {
	width: 100%;
	height: 100%;
	position: absolute;
	top: 0;
	left: 0;
	padding: 9px 11px;
	text-align: center;
	background: rgba(0, 0, 0, 0.7);
	transform: rotateY(90deg);
	transition: all 0.50s ease-in-out 0s;
}

.box:hover .box-content {
	transform: rotateY(0);
}

.box .title {
	font-size: 18px;
	color: #fff;
	text-transform: uppercase;
}

.box .description {
	font-size: 14px;
	line-height: 24px;
	color: #fff;
}

.box .title:after,
.box .description:after {
	content: "";
	width: 75%;
	display: block;
	/*  border-bottom: 1px solid #fff;*/
	margin: 15px auto;
}

.box .social-links {
	margin: 0;
	padding: 0;
	list-style: none;
}

.box .social-links li {
	display: inline-block;
	margin: 0 10px;
}

.box .social-links li a {
	font-size: 20px;
	color: #a6a6a6;
}

.box .social-links li a:hover {
	text-decoration: none;
	color: #fff;
}

@media only screen and (max-width: 990px) {
	.box {
		margin-bottom: 0px;
	}
}

@media only screen and (max-width: 479px) {
	.box .box-content {
		padding: 20px;
	}
}