What’s the neat feature at the bottom of the page that sticks around when you scroll?

That’s generally referred to as a sticky footer or a fixed bottom bar. If it’s designed for actions like buttons or navigation, folks might call it a bottom navigation bar or an action bar. For alerts, promotions, or cookie consent notices, you might hear it described as a sticky banner or a persistent notification bar. Essentially, it boils down to using `position: fixed; bottom: 0;`—but the name depends on what it's used for.