.round{
  margin-left:20%;
  margin-top:5%;
}

@keyframes scaling{
  0%, 100%{
    transform: scale(0.2);
    background-color: #30FFB7;
  }
  40%{
    transform: scale(1);
    background-color: #07DEFF;
  }
  50%{
    transform: scale(1);
    background-color: #0761FF;
  }
}

.circle {
    height: 40px;
    width: 40px;
    border-radius:50%;
    transform: scale(0);
    background-color:red;
    animation: scaling 2.5s ease-in-out infinite;
    display: inline-block;
    margin:.5rem;
}

div:nth-child(0){
  animation-delay:0s;
}
div:nth-child(1){
  animation-delay:0.2s;
}
div:nth-child(2){
  animation-delay:0.4s;
}
div:nth-child(3){
  animation-delay:0.6s;
}
div:nth-child(4){
  animation-delay:0.8s;
}
div:nth-child(5){
  animation-delay:1s;
}