et class="layui-elem-field layui-field-title">
    <legend>从小屏幕堆叠到桌面水平排列</legend>
  </fieldset>

  <div class="layui-row">
    <div class="layui-col-md1">
      <div class="grid-demo grid-demo-bg1">1/12</div>
    </div>
    <div class="layui-col-md1">
      <div class="grid-demo">1/12</div>
    </div>
    <div class="layui-col-md1">
      <div class="grid-demo grid-demo-bg1">1/12</div>
    </div>
    <div class="layui-col-md1">
      <div class="grid-demo">1/12</div>
    </div>
   