JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
        <td>asd
            <span class="arrow"></span>
        </td>
    </tr>
</table>

CSS

table { border: 1px solid black; border-spacing: 0; }
table td { position: relative; padding: 5px }
table td span.arrow { 
    position: absolute; 
	top: 0; 
	right: 0;
	border-top: 5px solid red;
	border-left: 5px solid transparent;
}