i class='layui-col-xs4 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i class="fa fa-file-video-o"></i><span>fa-file-video-o</span></li>
                <li class='layui-col-xs4 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i class="fa fa-file-o"></i><span>fa-file-o</span></li>
                <li class='layui-col-xs4 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i class="fa fa-file-pdf-o"></i><span>fa-file-pdf-o</span></li>
                <li class='layui-col-xs4 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i