.wechat ul{
    overflow: hidden;
    padding: 5vh 0;
}
.wechat ul li{
    float: left;
    width: 30%;
    margin-right: 5%;
    margin-bottom: 5vh;
    position: relative;
}
.wechat ul li:nth-of-type(3n){
    margin-right: 0;
}
.wechat ul li>img{
    width: 100%;
    display: block;
}
.wechat ul li>img.hover{
    width: auto;
}
.wechat ul li .hover{
    display: none;
}
.wechat ul li p{
    background: rgba(0,104,183,0.72);
    color: #fff;
    line-height: 50px;
    position: absolute;
    bottom: 0;
    width: 100%;
    padding-left: 5%;
    box-sizing: border-box;
}
.wechat ul li>div.hover{
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background: rgba(0,104,183,0.72);
}
.wechat ul li>img.hover{
    width: 30%;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-left: -15%;
    margin-top: -15%;
}
.wechat ul li:hover .hover{
    display: block;
}
.wechat ul li:hover p{
    display: none;
}