discourse/app/assets/stylesheets/common/float-kit/d-tooltip.scss

@keyframes d-tooltip-opening {
  0% {
    opacity: 0;
  }

  100% {
    opacity: 1;
  }
}

.fk-d-tooltip {
  background-color: var(--secondary);
  border-radius: var(--d-border-radius);
  border: 1px solid var(--primary-low);
  box-shadow: var(--shadow-menu-panel);
  z-index: z("max");
  width: max-content;
  position: absolute;
  top: 0;
  display: flex !important;
  padding: 0;

  &__trigger {
    display: inline-flex;
    cursor: pointer;

    .touch & {
      @include unselectable;
    }

    &-container {
      display: flex;
    }
  }

  &.-animated {
    animation: d-tooltip-opening 0.15s ease-in;

    &[data-placement^="bottom"] {
      transform-origin: top center;
    }

    &[data-placement^="top"] {
      transform-origin: bottom center;
    }

    &[data-placement^="right"] {
      transform-origin: center left;
    }

    &[data-placement^="left"] {
      transform-origin: center right;
    }
  }

  &__inner-content {
    display: flex;
    overflow: hidden;
    overflow-wrap: break-word;
    padding: 0.5rem;
    align-items: center;
  }

  .arrow {
    z-index: z("max");
    position: absolute;
  }

  &[data-placement^="top"] {
    .arrow {
      bottom: -10px;
      rotate: 180deg;
    }
  }

  &[data-placement^="top-start"] {
    .arrow {
      margin-left: 10px;
    }
  }

  &[data-placement^="bottom"] {
    .arrow {
      top: -10px;
    }
  }

  &[data-placement^="right"] {
    .arrow {
      rotate: -90deg;
      left: -10px;
    }
  }

  &[data-placement^="left"] {
    .arrow {
      rotate: 90deg;
      right: -10px;
    }
  }
}