sm3 layui-col-md2 layui-col-lg1 '><i class="fa fa-video-camera"></i><span>fa-video-camera</span></li>
                <li class='layui-col-xs4 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i class="fa fa-volume-down"></i><span>fa-volume-down</span></li>
                <li class='layui-col-xs4 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i class="fa fa-volume-off"></i><span>fa-volume-off</span></li>
                <li class='layui-col-xs4 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i class="fa fa-volume-up