JSFiddle - React, Tailwind, and code Playground

HTML

<div style="text-align: center;">
  	<h1>Title</h1>
	  <h2>tagline</h2>
	<div id="container">
      <!-- Module1 -->
      <div class="module" style="background-color: red;">
        <table>
          <tbody>
            <tr>
              <td valign="top">
                <p><strong>Module 1</strong></p>
                <p>lorem ipsum</p>
                <p>lorem ipsum</p>
                <p>lorem ipsum</p>
              </td>
            </tr>
            <tr>
              <td valign="bottom">
                <div id="mc_embed_signup">
                  <form>
                    <div>
                      <div><input name="EMAIL" type="email" value="" placeholder="email address" /></div>
                        
                     </div>
                    <br/>
                      <div><input type="submit" value="button" /></div>
                    </div>
                  </form>
                </div>
              </td>
            </tr>
      
          </tbody>
        </table>
      </div>
      <!-- Fin module 1, début module 2 -->
      <div class="module" style="background-color: green;">
        <table>
          <tbody>
            <tr>
              <td valign="top">
                <p><strong>Module 2</strong></p>
              </td>
            </tr>
            <tr>
              <td valign="bottom">
                <div>
                  <form>
                    <div>
                      <div><input name="EMAIL" type="email" placeholder="email address" /></div>
                        
                     </div>
                    <br/>
                      <div class="clear"><input name="subscribe" type="submit" value="button" /></div>
                    </div>
                  </form>
                </div>
              </td>
            </tr>
       
          </tbody>
        </table>
      </div>
<!-- Fin module 2, début module 3 -->
      <div class="module" style="background-color: yellow;">
        <table>
         ...

CSS

#container {
		display: flex;
		align-items: stretch;
	}
	
	.module {
		margin-right: 2em;
		border: 1px solid white;
		flex-basis: 30%;
	}
  .module table {height:100%; min-height:100%; height:100%;}