The simplest inline-block loader with inherit color

loader.css

.loader {
  color: inherit;
  display: inline-block;
  cursor: wait;
}

.loader > span {
  animation-name: blink;
  animation-duration: 1.4s;
  animation-iteration-count: infinite;
  animation-fill-mode: both;
}

.loader > span:before {
  content: "\25cf";
}

.loader > span:nth-child(2) {
  animation-delay: 0.2s;
}

.loader > span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes blink {
  0% {
    opacity: 0.2;
  }
  20% {
    opacity: 1;
  }
  100% {
    opacity: 0.2;
  }
}

loader.html

<div class="loader">
  <span />
  <span />
  <span />
</div>