JSFiddle - React, Tailwind, and code Playground

HTML

<table border="1" width="100%">
<tr>
<td>a</td><td>a</td></tr>
<tr>
<td>a</td><td>a</td></tr>

<tr>
<td colspan="2">b</td>

</tr>
<tr><td class="test">c</td></tr>


</table>

CSS

td {
border: 1px solid red;
}
.test {
background:green;

}