body{
  margin: 0;
  padding: 0;
  background: #262626;
}
ul{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  margin: 0;
  padding: 0;
  display: flex;
}
ul li{
  list-style: none;
  width: 40px;
  height: 40px;
  background: #fff;
  border-radius: 50%;
  animation: animate 1.6s ease-in-out infinite;
}
@keyframes animate{
  0%, 40%, 100%{
    transform: scale(0.2);
  }
  20%{
    transform: scale(1);
  }
}
ul li:nth-child(1){
  animation-delay: -1.4s;
  background: #ffff00;
  box-shadow: 0 0 50px #ffff00;
}
ul li:nth-child(2){
  animation-delay: -1.2s;
  background: #76ff03;
  box-shadow: 0 0 50px #76ff03;
}
ul li:nth-child(3){
  animation-delay: -1s;
  background: #ff0091;
  box-shadow: 0 0 50px #ff0091;
}
ul li:nth-child(4){
  animation-delay: -0.8s;
  background: #00bfb2;
  box-shadow: 0 0 50px #00bfb2;
}
ul li:nth-child(5){
  animation-delay: -0.6s;
  background: #b10ffb;
  box-shadow: 0 0 50px #b10ffb;
}
ul li:nth-child(6){
  animation-delay: -0.4s;
  background: #f57c00;
  box-shadow: 0 0 50px #f57c00;
}
ul li:nth-child(7){
  animation-delay: -0.2s;
  background: #673ab7;
  box-shadow: 0 0 50px #673ab7;
}