DedeV6/src/theme/plus/plus_footer.htm

<footer class="bg-success mt-3">
    <div class="copyright py-5">
        <p class="text-center">
            {dede:global.cfg_powerby/} {dede:global.cfg_beian/} Powered by <a href="https://www.dedebiz.com" title="DedeBIZ内容管理系统-国内流行的内容管理系统多端全媒体解决方案" target="_blank">DedeBIZ{dede:global.cfg_version/}</a>
        </p>
    </div>
</footer>
<div class="scroll-top">
    <button onclick="gotop()" id="btnScrollTop">
        <i class="fa fa-chevron-up"></i> 
    </button>
</div>
<script src="<?php echo $cfg_cmsurl; ?>/static/web/js/bootstrap.bundle.min.js"></script>
<script src="<?php echo $cfg_cmsurl; ?>/static/web/js/style.js"></script>