$cellHeight: 30px;

ul {
    list-style: none;
    margin: 0;
    padding: 0;
  }
  .box {
    width: 60%;
    margin: auto;
  }
  .header {
    display: flex;
  }
  .body {
    height: 5 * $cellHeight;
    overflow: hidden;
    // padding-bottom: 10px;
    li {
      display: flex;
      height: $cellHeight;
    }
  }
  .cell {
    flex: 1;
    height: $cellHeight;
    line-height: $cellHeight;
    border: 1px solid #e2e2e2;
    box-sizing: border-box;
  }
  .list {
    animation: scroll 10s  linear infinite;
    position: relative;
  }
   
  @keyframes scroll {
    from { top: 0; }
    to { top: -20 * $cellHeight }
  }