.demo{padding-bottom:672px;}
:root{
	--color_1: #fff;
	--main-color: #1dd1a1;
}
.box{
	font-family: 'Microsoft Yahei', sans-serif;
	text-align: center;
	position: relative;
	overflow: hidden;
}
.box:before,
.box:after,
.box-content:before,
.box-content:after{
	content: '';
	background: linear-gradient(transparent,rgba(0,0,0,0.9));
	height: 100%;
	width: 25%;
	transform: translateY(-100%);
	position: absolute;
	left: 0;
	top: 0;
	z-index: 1;
	transition: all 0.3s;
}
.box:hover:before,
.box:hover:after,
.box:hover .box-content:before,
.box:hover .box-content:after{
	transform: translateY(0);
}
.box:after{ left: 25%; }
.box .box-content:before{ left: 50%; }
.box .box-content:after{ left: 75%; }
.box:hover:before{ transition-delay: 0.225s; }
.box:hover:after{ transition-delay: 0.075s; }
.box:hover .box-content:before{ transition-delay: 0.15s; }
.box:hover .box-content:after{ transition-delay: 0s; }
.box img{
	width: 100%;
	height: auto;
	transition: all 0.3s ease 0s;
}
.box:hover img{ filter: grayscale(100%); }
.box .box-content{
	width: 100%;
	height: 100%;
	position: absolute;
	bottom: 0;
	left: 0;
	transition: all 0.2s;
}
.content{
	width: 100%;
	padding: 7px 0;
	opacity: 0;
	position: absolute;
	left: 0;
	bottom: -30px;
	z-index: 2;
	transition: all 0.3s ease 0.1s;
}
.box:hover .content{
	opacity: 1;
	bottom: 5px;
}
.box .title{
    color: #fff;
    font-size: 16px;
    position: relative;
    bottom: 22px;
}
.box .post{

    font-size: 26px;
    margin-bottom: 10px;
    display: block;
    color: #fff;
}
.box .icon{
	padding: 0;
	margin: 0;
	list-style: none;
	transform: translateX(-50%);
	position: absolute;
	top: 15px;
	right: -10px;
	z-index: 2;
	transition: all 0.5s ease 0.3s;
}
.box .icon li{
	opacity: 0;
	transform: scale(0) rotate(360deg);
	transition: all 400ms;
}
.box:hover .icon li{
	opacity: 1;
	transform: scale(1) rotate(0);
}
.box .icon li a{
	color: var(--color_1);
	background-color: var(--main-color);
	font-size: 20px;
	line-height: 40px;
	height: 40px;
	width: 40px;
	margin-bottom: 10px;
	border-radius: 50%;
	display: block;
	position: relative;
	transition: all 0.3s;
}
.box .icon li a:hover{
	text-decoration: none;
	color: var(--main-color);
	background-color: var(--color_1);
	border-radius: 0 20px 0 20px;
}
@media only screen and (max-width:990px){
	.box{ margin-bottom: 30px; }
}
@media only screen and (max-width:479px){
	.box .title{ font-size: 20px; }
}