JSFiddle - React, Tailwind, and code Playground
HTML
<table border=1>
<colgroup>
<col />
<col colspan=2 />
<col />
</colgroup>
<colgroup>
<col />
<col />
<col />
<col />
</colgroup>
</table>CSS
colgroup { display: table-row; }
col { display: table-cell; }
col::after { content: "+"; display: inline; }