Back-to-top button
Adds a floating button that appears after scrolling and smoothly returns to the top of the page.
Code to copy
var btn = document.createElement('button');
btn.textContent = '↑';
btn.title = 'Back to top';
btn.style.cssText = 'position:fixed;bottom:20px;right:20px;z-index:99999;width:44px;height:44px;border-radius:50%;border:none;background:#006870;color:#fff;font-size:20px;cursor:pointer;box-shadow:0 2px 8px rgba(0,0,0,.3);display:none';
btn.onclick = function () { window.scrollTo({ top: 0, behavior: 'smooth' }); };
window.addEventListener('scroll', function () {
btn.style.display = window.pageYOffset > 300 ? 'block' : 'none';
});
document.body.appendChild(btn);How to use this example
- Copy the code with the button above.
- Install JustZix (2 minutes) and open the extension on the target page.
- Add a new rule matching that page.
- Paste the code into the rule's JavaScript panel and save — it runs on every page visit.
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