* {
  margin: 0px;
  padding: 0px;
}
div {
  width: 100px;
  height: 100px;
  border: 1px solid black;
  border-radius: 50%;
  float: left;
  margin: 10px;
  transition: all 1s;
}
div:nth-child(2n) {
  background-color: #28c3d4;
}
div:nth-child(2n + 1) {
  background-color: #ff6768;
}
div:hover {
  transform: scale(1.5);
}
