flood/client/source/sass/components/_loading-indicator.scss

$loading-indicator--bar--background: #e9eef2;
$loading-indicator--bar--background--inverse: rgba(#38586d, 0.7);
$loading-indicator--tick--background: rgba($blue, 0.75);
$loading-indicator--tick--background--inverse: rgba($blue, 0.75);

@keyframes loading-indicator-swipe {
  0% {
    transform: translateX(-100%);
  }

  50% {
    transform: translateX(400%);
  }

  100% {
    transform: translateX(400%);
  }
}

.loading-indicator {
  height: 18px;
  position: relative;
  width: 32px;

  &.is-inverse {

    .loading-indicator {

      &__bar {
        background: $loading-indicator--bar--background--inverse;

        &:after {
          background: $loading-indicator--tick--background--inverse;
        }
      }
    }
  }

  &__bar {
    background: $loading-indicator--bar--background;
    border-radius: 10px;
    height: 3px;
    left: 0;
    overflow: hidden;
    position: absolute;
    transform: translateY(0);
    width: 100%;

    &:after {
      animation: loading-indicator-swipe 3s ease-in-out infinite;
      background: $loading-indicator--tick--background;
      border-radius: 10px;
      content: '';
      display: block;
      height: 100%;
      transform: translateX(-100%);
      width: 25%;
    }

    &--1 {
      top: 0;
    }

    &--2 {
      top: 50%;
      transform: translateY(-50%);

      &:after {
        animation-delay: 0.5s;
      }
    }

    &--3 {
      bottom: 0;

      &:after {
        animation-delay: 1s;
      }
    }
  }
}