Add Border to Circle Images

you can style on advanced tab an image hover effect
– if you choose the first one “slightly increase the image size” it will be better to have the border on the image container:

.av-styling-circle .avia_image {
  border: 4px solid #bf207f;
}

for all the other hover effects it is better to have the border on a parent container:

.av-styling-circle .avia-image-container-inner {
  border: 4px solid #bf207f;
}