Blog Layout/Masonry - Circle Photos

In the blog layout - masonry style, is it possible to turn the featured image into a circle rather than a square?

Here’s our blog:

Hello there,

Try adding the below CSS code to Appearance > Customize > Additional CSS from dashboard.

    .blog .entry-thumb img,
    .archive .entry-thumb img {
      width: 300px;
      height: 300px;
      object-fit: cover;
      border-radius: 300px;
      max-width: 100%;