JSFiddle - React, Tailwind, and code Playground

by Denis Ineshin

HTML

<div id="block-1">
    <div id="block-2">
        <div id="block-3">
            Scroll page
        </div>
    </div>
</div>

CSS

#block-1 {
    height: 2000px;
}

#block-3 {
    position: fixed;
    top: 0; left: 0;
    padding: 10px;
    background: green;
    color: white;
}