lachang-wxapp/ThorUI/components/grid/grid.wxss

.tui-grids {
  width: 100%;
  position: relative;
  overflow: hidden;
}
.tui-grids::after {
  content: " ";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 1px;
  border-top: 1px solid #eaeef1;
  -webkit-transform-origin: 0 0;
  transform-origin: 0 0;
  -webkit-transform: scaleY(0.5);
  transform: scaleY(0.5);
}
.tui-border-top::after {
  border-top:0 !important;
}