three-dots/less/_dot-shuttle.less

CSS loading animation made by single element.

/**
 * ==============================================
 * Experiment-Gooey Effect
 * Dot Shuttle
 * ==============================================
 */

@dotColorHSL: hsl(0, 100%, 0%);

@d: 50px;

.dot-shuttle {
  .dot(@width: 12px, @height: 12px, @radius: 6px, @bgColor: @dotColorHSL, @color: transparent);

  filter: blur(2px);
  margin: -1px 0;
  position: relative;

  &::before,
  &::after {
    .dot(@width: 12px, @height: 12px, @radius: 6px, @bgColor: @dotColorHSL, @color: transparent);

    animation: dotShuttle 2s infinite ease-in;
    content: "";
    //display: inline-block;
    filter: blur(2px);
    left: -@d;
    opacity: 0;
    position: absolute;
    top: 0;
  }
  &::after { animation-delay: 1s; }
}

@keyframes dotShuttle {
  0% {
    opacity: 0;
    transform: translateX(0);
  }

  50% {
    opacity: 1;
    transform: translateX(@d);
  }

  100% {
    opacity: 0;
    transform: translateX(@d*2);
  }
}