Adding
.qa-avatar-image {
border-radius: 50px;
}
to your qa-styles.css file should do the trick for most of the avatar locations.
Then just wrap that CSS into the appropriate media query for what you consider to be "cellular view". E.G.:
@media all and (min-width:481px) and (max-width: 568px) {
.qa-avatar-image {
border-radius: 50px;
}
}