el-dialog水平垂直居中

<style lang="scss" scoped>  
// 如果没有scoped属性，直接写 .el-dialog 即可;
:deep(.el-dialog) {
    display: flex;
    flex-direction: column;
    margin: 0 !important;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-height: calc(100% - 30px);
    max-width: calc(100% - 30px);
  }
</style>