JSFiddle - React, Tailwind, and code Playground

HTML

<div id="head">
    =HEADER=<br />
    =HEADER=<br />
    =HEADER=<br />
    =HEADER=<br />
    =HEADER=<br />
    =HEADER=<br />
</div>
<div id="nav">
    ------------<br />
    =NAVIGATION=<br />
    ------------
</div>
<div id="body">
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
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    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
    =BODY=<br />
</div>

CSS

div {
    font-size: 16px;
    width: 100%;
    text-align: center;
    color: #000;
    background: #fff;
    font-family: "Courier New", Courier, monospace;
    line-height: 16px;
}

#head {
    position: absolute;
    top: 0em;
    height: 6em;
    z-index: 0;
}

#nav {
    position: fixed;
    top: 96px;
    height: 3em;
    z-index: 1;
}

#body {
    position: absolute;
    top: 9em;
    z-index: 0;
}

JavaScript

$(window).scroll(function(){
    $("#nav").css("top",Math.max(0,96-$().scrollTop()));
});