style.scss

.kanban {
  .grid {
    position: relative;
    display: block;
    .item {
      display: block;
      position: absolute;
      //   width: 25%;
      width: 100%;
      height: 200px;
      padding: 5px;
      z-index: 1;
      color: #fff;
    }
    // div[swapindex='-1']{
    //   display: none;
    // }
    .item.muuri-item-dragging {
      z-index: 3;
    }
    .item.muuri-item-releasing {
      z-index: 2;
    }
    .item.muuri-item-hidden {
      z-index: 0;
    }
    .item-content {
      position: relative;
      background: #000;
      width: 100%;
      height: 100%;
    }

    .item.muuri-item-dragging .item-content,
    .item.muuri-item-releasing .item-content {
      background: blue;
    }
  }
}