.material-img .el-col.el-col-4{position:relative}.mask{position:absolute;top:0;left:10px;right:10px;bottom:0;border:1px solid #eee}.mask-active{background-color:rgba(0,0,0,.5)}.btn-show{position:absolute;top:100px;left:30%}.material-p{font-size:12px;color:#8a8282}