.index_center {
    width: fit-content;
    position: absolute;
    /*bottom: 0;*/
    /*top: 0;*/
    left: 0;
    right: 0;
    margin: 0 auto;
    height: fit-content;
}
.gunlun::-webkit-scrollbar, textarea::-webkit-scrollbar{
  /*滚动条整体样式*/
  width : 6px;  /*高宽分别对应横竖滚动条的尺寸*/
  height: 1px;
  }
  .gunlun::-webkit-scrollbar-thumb,  textarea::-webkit-scrollbar-thumb {
  /*滚动条里面小方块*/
  border-radius: 10px;
  box-shadow   : inset 0 0 5px rgba(0, 0, 0, 0.2);
  background   : #cdc6c6;
  }
  .gunlun::-webkit-scrollbar-track  , textarea::-webkit-scrollbar-track {
  /*滚动条里面轨道*/
  box-shadow   : inset 0 0 5px rgba(0, 0, 0, 0.2);
  border-radius: 10px;
  background   : #fcfbfb;
  }
  .space {
    width: 80%;
    height: 0;
    border-bottom: 1px solid #919fb873;
    margin: 5px;
}
  li{
      list-style: none;
  }