JSFiddle - React, Tailwind, and code Playground

HTML

<table style="width: 100%;">
    <tr>
      <td><input class="top" type="text" id="topTextbox"></td>
    </tr>
    <tr>
      <td>
        <select class="bottom">
            <option value="0"></option>
            <option value="saab">Saab</option>
            <option value="mercedes">Mercedes</option>
        </select>
      <input class="bottom" type="text" id="bottomTextbox">
     </td>
    </tr>
  </table>

CSS

.top{width: 300px;}
.bottom{width: 148px;}/* The space between select & input = 4px */