JSFiddle - React, Tailwind, and code Playground

HTML

<table>
<tr id="sidebar"><td>Some data</td></tr>
<tr id="main"><td>Some data 2</td></tr>
</table>

CSS

table{width:1000px; outline:1px solid #000;}
#sidebar
{
display:table-cell;
width:210px;
float:left;
}
#main
{
display:table-cell;
width:730px;
float:left;
}