vikunja-frontend/src/styles/components/base/tooltip.scss

.tooltip {
  visibility: collapse;
  z-index: 10000;
  font-size: 0.8em;
  text-align: center;
  background: $dark;
  color: white;
  border-radius: 5px;
  padding: 5px 10px 5px;
  opacity: 0;
  transition: opacity $transition;

  // If the tooltip is multiline, it would make the height calculations needed to properly position it a lot harder.
  white-space: nowrap;
  overflow: hidden;

  &-arrow {
    opacity: 0;
    content: '';
    visibility: collapse;
    position: absolute;
    transition: opacity $transition;
    z-index: 10000;

    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid $dark;

    &.bottom {
      transform: rotate(180deg);
    }
  }

  &.visible, &-arrow.visible {
    opacity: 1;
    visibility: visible;
  }

  &[x-placement^="top"] {
    margin-bottom: 5px;

    .tooltip-arrow {
      border-width: 5px 5px 0 5px;
      border-left-color: transparent !important;
      border-right-color: transparent !important;
      border-bottom-color: transparent !important;
      bottom: -5px;
      left: calc(50% - 5px);
      margin-top: 0;
      margin-bottom: 0;
    }
  }

  &[x-placement^="bottom"] {
    margin-top: 5px;

    .tooltip-arrow {
      border-width: 0 5px 5px 5px;
      border-left-color: transparent !important;
      border-right-color: transparent !important;
      border-top-color: transparent !important;
      top: -5px;
      left: calc(50% - 5px);
      margin-top: 0;
      margin-bottom: 0;
    }
  }

  &[x-placement^="right"] {
    margin-left: 5px;

    .tooltip-arrow {
      border-width: 5px 5px 5px 0;
      border-left-color: transparent !important;
      border-top-color: transparent !important;
      border-bottom-color: transparent !important;
      left: -5px;
      top: calc(50% - 5px);
      margin-left: 0;
      margin-right: 0;
    }
  }

  &[x-placement^="left"] {
    margin-right: 5px;

    .tooltip-arrow {
      border-width: 5px 0 5px 5px;
      border-top-color: transparent !important;
      border-right-color: transparent !important;
      border-bottom-color: transparent !important;
      right: -5px;
      top: calc(50% - 5px);
      margin-left: 0;
      margin-right: 0;
    }
  }

  &.popover {
    .popover-inner {
      background: $light;
      color: $dark;
      padding: 24px;
      border-radius: 5px;
      box-shadow: 0 5px 30px rgba(black, .1);
    }

    .popover-arrow {
      border-color: $light;
    }
  }

  &[aria-hidden='true'] {
    visibility: hidden;
    opacity: 0;
    transition: opacity .15s, visibility .15s;
  }

  &[aria-hidden='false'] {
    visibility: visible;
    opacity: 1;
    transition: opacity .15s;
  }
}