.data-master {
  display: flex;
  flex: auto;
  height: 100%;
  background-color: #fff;

  .left-wrap {
    flex: none;
    overflow: hidden;
    height: 100%;
    border-right: 1px solid #EFEFEF;
  }

  .left-collapse-wrap {
    flex: none;
    position: relative;
    width: 20px;
    height: 100%;
  
    .left-collapse {
      display: inline-flex;
      justify-content: center;
      align-items: center;
      left: 0;
      right: 0;
      background: #f2f5fc;
      position: absolute;
      top: calc(50% - 40px);
      width: 12px;
      height: 80px;
      border-radius: 0 12px 12px 0;
      -ms-transform: translateY(-50%);
      transform: translateY(-50%);
      cursor: pointer;
    }
  }

  .right-wrap {
    flex: 1;
    overflow: hidden;
    height: 100%;
  }
}

.data-master-collapse {
  .left-wrap {
    width: 0 !important;
  }
}