JSFiddle - React, Tailwind, and code Playground

HTML

<table id="table-prices"> 
    <tr>
      <td></td>
      <td colspan="2" class="table-main">Длина</td>
    </tr>
    <tr>
      <td>Ширина</td>
      <td>190 см</td>
      <td>200 см</td>
    </tr>
    <tr>
      <td>80 см</td>
      <td>5496</td>
      <td>5496</td>
    </tr>
    <tr>
      <td>140 см</td>
      <td>5496</td>
      <td>5496</td>
    </tr>
    <tr>
      <td colspan="3">Цены указаны в грн.</td>
    </tr>
  </table>





<table id="table-prices" style="border-collapse: collapse;"> 
    <tr>
      <td></td>
      <td colspan="2" class="table-main">Длина</td>
    </tr>
    <tr>
      <td>Ширина</td>
      <td>190 см</td>
      <td>200 см</td>
    </tr>
    <tr>
      <td>80 см</td>
      <td>5496</td>
      <td>5496</td>
    </tr>
    <tr>
      <td>140 см</td>
      <td>5496</td>
      <td>5496</td>
    </tr>
    <tr>
      <td colspan="3">Цены указаны в грн.</td>
    </tr>
  </table>

CSS

table {
    border: 1px solid #f00;
    border-radius: 10px;
}