layui悬浮按钮固定在窗口底部，滚动无变化

<div class="layer-footer" style="z-index: 10; position: fixed; text-align: right; margin-left: -10%; bottom: 0; width:100%; height:50px">
    <button style="height: 40px;width: 60px" type="button" class="layui-btn layui-btn-sm layui-btn-primary" lay-submit=""  lay-filter="formDemo">通过</button>
    <button style="height: 40px;width: 60px" type="button" class="layui-btn layui-btn-sm layui-btn-primary" lay-submit=""  lay-filter="formDemo">驳回</button>
</div>