.attachment-medium.size-medium.wp-post-image {
  border-top-right-radius: 15px;
  border-top-left-radius: 20px;
}

.box-text.text-center {
  border-bottom-right-radius: 15px;
  border-bottom-left-radius: 15px;
}

.attachment-large.size-large.wp-post-image {
  height: 350px;
  width: 303px;
}