体容器（宽度自适应，不固定）</legend>
  </fieldset>

  <div class="layui-row">
    <div class="layui-col-sm3">
      <div class="grid-demo grid-demo-bg1">25%</div>
    </div>
    <div class="layui-col-sm3">
      <div class="grid-demo">25%</div>
    </div>
    <div class="layui-col-sm3">
      <div class="grid-demo grid-demo-bg1">25%</div>
    </div>
    <div class="layui-col-sm3">
      <div class="grid-demo">25%</div>
    </div>
  </div>
</div>

<br><br>

</body>
</html>
