body {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #000;
}
div.container {
  display: flex;
  justify-content: center;
  align-items: center;
}
div > div {
  width: 2vw;
  height: 2vw;
  margin: 1vw;
  border-radius: 25%;
  animation: bounce 2.5s 0.2s linear infinite;
}
.yellow {
  background-color: #feb60a;
}
.red {
  background-color: #ff0062;
}
.green {
  background-color: #10ad00;
}
.blue {
  background-color: #004ae3;
}
@keyframes bounce {
  0%,
  50%,
  100% {
    transform: scale(0.7);
    transform: rotate(360deg);
  }
  25% {
    transform: scale(0.6);
    transform: rotate(90deg);
  }
  50% {
    transform: rotate(180deg);
  }
  75% {
    transform: rotate(270deg);
    transform: scale(1.2);
  }
  100% {
    transform: rotate(360deg);
    transform: scale(0.7);
  }
}