How to vertically center a text in a column (bootstrap 4)? : <p>How to vertically center a text in a column (bootstrap 4)? The structure is basic, see:</p>

<pre><code>&lt;div class="row"&gt;
    &lt;div class="col-md-6"&gt;
        &lt;span&gt;Text to center&lt;/span&gt;
    &lt;/div
&lt;/div&gt;
</code></pre>

<p>Ty guys!</p>
