JSFiddle - React, Tailwind, and code Playground

HTML

<div id="table-container">
<table id="maintable">
    <thead>
        <tr>
            <th>Col1</th>
            <th>Col2</th>
            <th>Col3</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>info</td>
            <td>info</td>
            <td>info</td>
        </tr>
        <tr>
            <td>info</td>
            <td>info</td>
            <td>info</td>
        </tr>
        <tr>
            <td>info</td>
            <td>some really long line here instead</td>
            <td>info</td>
        </tr>
        <tr>
            <td>info</td>
            <td>info</td>
            <td>info</td>
        </tr>
                <tr>
            <td>info</td>
            <td>info</td>
            <td>info</td>
        </tr>
                <tr>
            <td>info</td>
            <td>info</td>
            <td>info</td>
        </tr>
                <tr>
            <td>info</td>
            <td>info</td>
            <td>info</td>
        </tr>
    </tbody>
</table>
<div id="bottom_anchor"></div>
</div>

CSS

body { height: 1000px; }
thead{
    background-color:white;
}
table td,
table th {
  border: 1px solid black;
}

JavaScript

function moveScroll(){
    var scroll = $(window).scrollTop();
    var anchor_top = $("#maintable").offset().top;
    var anchor_bottom = $("#bottom_anchor").offset().top;
    if (scroll>anchor_top && scroll<anchor_bottom) {
    clone_table = $("#clone");
    if(clone_table.length == 0){
        clone_table = $("#maintable").clone();
        clone_table.attr('id', 'clone');
        clone_table.css({position:'fixed',
                 'pointer-events': 'none',
                 top:0});
        clone_table.width($("#maintable").width());
        $("#table-container").append(clone_table);
        $("#clone tbody").css({visibility:'hidden'});
        $("#clone thead").css({visibility:'visible'});
        $("#clone thead th").css({border:'1px solid black'});
    }
    } else {
    $("#clone").remove();
    }
}
$(window).scroll(moveScroll);