<p>Well, adding CSS classes is easy :).<br>
Do the mentioned classes exist somewhere or were they just meant as example?</p>
<p>Bootstrap provides a few: <a href="https://getbootstrap.com/docs/3.3/css/#images" rel="nofollow">https://getbootstrap.com/docs/3.3/css/#images</a>, though not sure if this is what you mean. Currently, we use <code>img-thumbnail</code>.</p>

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