.v-ann-detail-img{position:relative;width:1000px;margin:20px auto}.v-ann-detail-img>div{position:relative;min-height:200px;background:#f1f1f1}.v-ann-detail-img>div .el-button{opacity:0;-webkit-transition:all .15s ease;transition:all .15s ease;position:absolute;right:20px;top:20px}.v-ann-detail-img>div:hover .el-button{opacity:1}