JSFiddle - React, Tailwind, and code Playground

HTML

<table class="bordered" cellspacing="0" border="0" id="ctl00_body_gvTimeTable" style="border-collapse:collapse;">
    <tr style="border-width:0px;">
        <th scope="col">One</th>
        <th scope="col">Two</th>
        <th scope="col">Three</th>
        <th scope="col">&nbsp;</th>
    </tr>
</table>

CSS

.bordered th
{
    border: 1px solid black;
}

.bordered th:last-child
{ 
    border: 0; 
     border-bottom: 0;  
}