JSFiddle - React, Tailwind, and code Playground

HTML

<div id="bottom-stuff">
        <div id="search">
                             MY DIV
            </div>
</div>

            <div id="bottom">
                             MY DIV
            </div>

CSS

#bottom-stuff {

    position: relative;
}

#bottom{

    position: fixed; 
    background:gray; 
    width:100%;
    bottom:0;
}

#search{height:5000px; overflow-y:scroll;}