<p>The screenshot shows the images with the BS3 class <code>img-rounded</code>. I think this comes close.<br>
Alternatively, we can add our own class for rounded borders based on the BS4 one (until someone does <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="459623984" data-permission-text="Issue title is private" data-url="https://github.com/geany/www.geany.org/issues/9" data-hovercard-type="issue" data-hovercard-url="/geany/www.geany.org/issues/9/hovercard" href="https://github.com/geany/www.geany.org/issues/9">#9</a>).</p>
<p><a target="_blank" rel="noopener noreferrer" href="https://user-images.githubusercontent.com/617017/60628743-570ab500-9de2-11e9-84f2-a48866c206ab.png"><img src="https://user-images.githubusercontent.com/617017/60628743-570ab500-9de2-11e9-84f2-a48866c206ab.png" alt="website_themes_rounded_corners" style="max-width:100%;"></a></p>

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