_speech_bubble.scss

@mixin speech_bubble($direction: up, $pointer-offset: 25%, $pointer-triangle-size: 28px) {
  $pointer-triangle-foreground-size: $pointer-triangle-size - 1;
  $base-position: null;
  $offset-position: null;

  @if $direction == up {
   $base-position: bottom;
   $offset-position: left;
  }
  @if $direction == down {
   $base-position: top;
   $offset-position: left;
  }
  @if $direction == left {
   $base-position: right;
   $offset-position: top;
  }
  @if $direction == right {
   $base-position: left;
   $offset-position: top;
  }

  border: $base-border;
  border-radius: $base-border-radius;
  padding: $base-spacing / 2 $base-spacing;
  background-color: $panel-primary;

  &:after, &:before {
    content: '';
    position: absolute;
    #{$base-position}: 100%;
    pointer-events: none;
  }

  &:before {
    @include triangle($pointer-triangle-size $pointer-triangle-size/2, $base-border-primary-color, $direction);
    #{$offset-position}: $pointer-offset;
  }

  &:after {
    @include triangle($pointer-triangle-foreground-size $pointer-triangle-foreground-size/2, $header-flyout-color, $direction);
    #{$offset-position}: calc(#{$pointer-offset} + 1px);
  }
}