bulma/docs/_sass/index/best.scss

$best-item-width: 520;
$best-screenshot-width: 504;
$best-count: 6;
$best-more-count: 6;
$best-total-count: $best-count + (2 * $best-more-count);
$best-total-width: $best-item-width * $best-total-count;
$best-speed: 100; // px per second
$best-duration: $best-total-width / $best-speed * 1s;
$best-padding: $block-spacing;
$best-height: 386px;

.bd-best {
  height: calc(#{$best-height} + #{$best-padding * 2});
  padding: $best-padding 0;
  overflow: hidden;
  position: relative;
}

.bd-best-list {
  align-items: stretch;
  animation-duration: $best-duration;
  animation-iteration-count: infinite;
  animation-timing-function: linear;
  display: flex;
  left: 0;
  position: absolute;
  top: $best-padding;

  animation-name: bdBestCarousel;
  // flex-wrap: wrap;

  &:hover {
    animation-play-state: paused;
  }
}

.bd-best-item {
  flex-grow: 0;
  flex-shrink: 0;
  margin-right: ($best-item-width - $best-screenshot-width) * 1px;
  transition-duration: $speed * 2;
  transition-property: box-shadow, transform;
  width: $best-screenshot-width * 1px;

  &.bd-is-medium {
    font-size: 1.125em;
  }

  &.bd-is-large {
    font-size: 1.25em;
  }

  &.bd-is-huge {
    font-size: 1.5em;
  }

  &:hover {
    box-shadow: 0 1em 1em rgba(black, 0.1);
    transform: translateY(-0.5em);
  }
}

.bd-screenshot {
  align-self: flex-start;
  display: block;
  transition-duration: $speed * 2;
  transition-property: box-shadow, transform;

  &,
  img {
    border-radius: $radius-large;
  }

  img {
    display: inline-block;
    height: auto;
    vertical-align: top;
    width: auto;
  }
}

@keyframes bdBestCarousel {
  100% {
    transform: translateX(
      calc(-100% + #{$best-item-width * $best-more-count * 1px})
    );
  }
}