Scroll-to-top button in the corner
Adds a floating button that appears after scrolling and smoothly returns you to the top.
Code to copy
var btn = document.createElement('button');
btn.textContent = '↑';
btn.setAttribute('aria-label', 'Scroll to top');
btn.style.cssText = 'position:fixed;right:20px;bottom:20px;width:44px;height:44px;' +
'border:none;border-radius:50%;background:#2563eb;color:#fff;font-size:20px;' +
'cursor:pointer;z-index:2147483647;box-shadow:0 2px 8px rgba(0,0,0,.3);display:none;';
btn.addEventListener('click', function () {
window.scrollTo({ top: 0, behavior: 'smooth' });
});
document.body.appendChild(btn);
window.addEventListener('scroll', function () {
btn.style.display = window.scrollY > 400 ? 'block' : 'none';
}, { passive: true });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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