Overleaf/services/web/frontend/stylesheets/components/image.scss

.img-rounded {
  border-radius: var(--border-radius-large);
}

.images-border-radius-base {
  img {
    border-radius: var(--border-radius-base);
  }
}

.images-border-radius-medium {
  img {
    border-radius: var(--border-radius-medium);
  }
}

.images-border-radius-large {
  img {
    border-radius: var(--border-radius-large);
  }
}