/*body {
  padding-top: 1em;
  background: currentcolor;
  color: #ccc;
  text-align: center;
}*/

.dot {
  background: #7189F0;
}
.dot, .dot:after {
  display: inline-block;
  width: 2em;
  height: 2em;
  border-radius: 50%;
  animation: a 1.5s calc(((var(--i) + var(--o, 0))/var(--n) - 1)*1.5s) infinite;
}
.dot:after {
  --o: 1;
  //background: black;
  content: "";
}

@keyframes a {
  0%, 50% {
    transform: scale(0);
  }
}