title: How to add class on the div of modal-content in react bootstap modal
body: <p>I am working with react-bootstrap and I need to add a class on modal-content div. I tried with <code>contentClassName</code> but it's not working. please suggest me what can I do?</p>
  <pre><code>&lt;Modal
     show={showModal}
     onHide={this.closeModal}
     size={size &amp;&amp; size}
     contentClassName=&quot;mx-auto&quot; // this is not working
     dialogClassName={`mw-100 mx-15 ${dialogClassName ? dialogClassName : ''}` }
  &gt;
     {children}
  &lt;/Modal&gt;
  </code></pre>