.page{
  display: flex;
  height: calc(100% - 60px);
  // overflow-y: scroll;
  overflow-y: hidden;
  .content-left{
    background-color:#fff;
  }
  .preview{
    height: 100%;
    overflow-y: scroll;
    padding: 20px 0 40px 0;
    flex: 1;
  }
  .proview{
    flex: 1;
  }
}