@mixin popper($arrow, $arrow-width, $arrow-distance, $bg) {
  display: block;
  visibility: visible;
  font-size: $font-size-small;
  line-height: $line-height-base;
  position: absolute;
  z-index: $zindex-tooltip;

  &[x-placement^=top] {
    padding: $arrow-width 0 $arrow-distance 0;
  }

  &[x-placement^=right] {
    padding: 0 $arrow-width 0 $arrow-distance;
  }

  &[x-placement^=bottom] {
    padding: $arrow-distance 0 $arrow-width 0;
  }

  &[x-placement^=left] {
    padding: 0 $arrow-distance 0 $arrow-width;
  }

  &[x-placement^=top] .#{$arrow} {
    bottom: $arrow-distance - $arrow-width;
    border-width: $arrow-width $arrow-width 0;
    border-top-color: $bg;
  }
  &[x-placement=top] .#{$arrow} {
    left: 50%;
    margin-left: -$arrow-width;
  }
  &[x-placement=top-start] .#{$arrow} {
    left: 16px;
  }
  &[x-placement=top-end] .#{$arrow} {
    right: 16px;
  }

  &[x-placement^=right] .#{$arrow} {
    left: $arrow-distance - $arrow-width;
    border-width: $arrow-width $arrow-width $arrow-width 0;
    border-right-color: $bg;
  }
  &[x-placement=right] .#{$arrow} {
    top: 50%;
    margin-top: -$arrow-width;
  }
  &[x-placement=right-start] .#{$arrow} {
    top: 8px;
  }
  &[x-placement=right-end] .#{$arrow} {
    bottom: 8px;
  }

  &[x-placement^=left] .#{$arrow} {
    right: $arrow-distance - $arrow-width;
    border-width: $arrow-width 0 $arrow-width $arrow-width;
    border-left-color: $bg;
  }
  &[x-placement=left] .#{$arrow} {
    top: 50%;
    margin-top: -$arrow-width;
  }
  &[x-placement=left-start] .#{$arrow} {
    top: 8px;
  }
  &[x-placement=left-end] .#{$arrow} {
    bottom: 8px;
  }

  &[x-placement^=bottom] .#{$arrow} {
    top: $arrow-distance - $arrow-width;
    border-width: 0 $arrow-width $arrow-width;
    border-bottom-color: $bg;
  }
  &[x-placement=bottom] .#{$arrow} {
    left: 50%;
    margin-left: -$arrow-width;
  }
  &[x-placement=bottom-start] .#{$arrow} {
    left: 16px;
  }
  &[x-placement=bottom-end] .#{$arrow} {
    right: 16px;
  }
}