JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
      <td class="no_border"></td>
      <td>R1:C2</td>
    </tr>
    <tr class="test">
      <td colspan="2">R2:C1</td>
    </tr>
  </table>

CSS

table {
    width: 100%;
    border-collapse: collapse;
  }

  td {
    padding: 5px;
    width: 50%;
    border: solid black 1px;
  }

  td.no_border {
    border: none;
  }
  .test td{
    border-top:none;
  }