There are many UI CSS classes that you can use to make your website responsive and mobile-first using the Bootstrap framework. If you want an image to be displayed with rounded corners you can make use of class img-rounded on the image element. If you want the image to be of circle shape then make use of the class img-circle.
Example :
<div style="margin:40px">
<img width="140px" height="140px" class="img-circle" src="mona-lisa.jpg"/>
</div>
<div style="margin:40px">
<img width="140px" height="140px" class="mona-lisa.jpg"/>
</div>
Output:

Bootstrap rounded and circled image
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