title: How can I center the selector-tags?
body: <p>Result as the image below</p>
  <p><a href="https://i.stack.imgur.com/lp9rc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lp9rc.png" alt="Result" /></a></p>
  <p>I want to center the two <code>&lt;selector&gt;</code> in the middle of the table cell. How can I achieve that? Right now the two <code>&lt;selector&gt;</code> tags are sticky on the left site.</p>
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;!DOCTYPE html&gt;
  &lt;body&gt;
      &lt;table class="center"&gt;
          &lt;tr&gt;
              &lt;td&gt; &lt;input type="number" value=0 id="n1" oninput="test()" /&gt; &lt;br /&gt;&lt;br /&gt; &lt;/td&gt;
              &lt;td&gt; &lt;/td&gt;
              &lt;td&gt; &lt;input type="text" value=0 id="result" readonly /&gt;&lt;br&gt;&lt;br&gt; &lt;/td&gt;
          &lt;/tr&gt;
          &lt;tr&gt;
              &lt;td&gt;
                      &lt;select id="selector1"&gt;
                          &lt;option value="s"&gt;Seconds&lt;/option&gt;
                          &lt;option value="m"&gt;Minutes&lt;/option&gt;
                      &lt;/select&gt;
              &lt;/td&gt;
              &lt;td&gt; &lt;button onclick="myFunction()"&gt;Invert&lt;/button&gt; &lt;/td&gt;
              &lt;td&gt;
                  &lt;select id="selector2"&gt;
                      &lt;option value="s"&gt;Seconds&lt;/option&gt;
                      &lt;option value="m"&gt;Minutes&lt;/option&gt;
                  &lt;/select&gt;
              &lt;/td&gt;
          &lt;/tr&gt;
      &lt;/table&gt;
  &lt;/body&gt;
  &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>