 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i class="fa fa-play-circle-o"></i><span>fa-play-circle-o</span></li>
                <li class='layui-col-xs4 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i class="fa fa-step-backward"></i><span>fa-step-backward</span></li>
                <li class='layui-col-xs4 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i class="fa fa-step-forward"></i><span>fa-step-forward</span></li>
                <li class='layui-col-xs4 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i c