.user {
  display: inline-block;
  width: 150px;
  height: 150px;
  border-radius: 50%;

  background-repeat: no-repeat;
  background-position: center center;
  background-size: cover;
}

.one {
  background-image: url('http://placehold.it/200x200');
}

.two {
  background-image: url('http://placehold.it/200x200');
}

.three {
  background-image: url('http://placehold.it/200x400');
}

.user2 {
  display: inline-block;
  width: auto;
  height: 150px;
  border-radius: 10px;

  background-repeat: no-repeat;
  background-position: center center;
  background-size: cover;
}