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              <div class="triangle"></div>

<div class="triangle-2"></div>

<div class="triangle-3"></div>
            
          
!
            
              //This is the awesome triangle mixin from bourbon. More info here: http://bourbon.io/docs/#triangle

// The $size argument can take one or two values—width height.

// The $color argument can take one or two values—foreground-color background-color.

// $direction: up, down, left, right, up-right, up-left, down-right, down-left

// FOR: Creates a visual triangle. Mixin takes ($size, $color, $direction)
// WHY: Because triangles.
// USE: @include triangle(12px 6px, gray lavender, up-left);

@mixin triangle($size, $color, $direction) {
  $width: nth($size, 1);
  $height: nth($size, length($size));
  $foreground-color: nth($color, 1);
  $background-color: if(length($color) == 2, nth($color, 2), transparent);
  height: 0;
  width: 0;

  @if ($direction == up) or ($direction == down) or ($direction == right) or ($direction == left) {
    $width: $width / 2;
    $height: if(length($size) > 1, $height, $height/2);

    @if $direction == up {
      border-bottom: $height solid $foreground-color;
      border-left: $width solid $background-color;
      border-right: $width solid $background-color;
    } @else if $direction == right {
      border-bottom: $width solid $background-color;
      border-left: $height solid $foreground-color;
      border-top: $width solid $background-color;
    } @else if $direction == down {
      border-left: $width solid $background-color;
      border-right: $width solid $background-color;
      border-top: $height solid $foreground-color;
    } @else if $direction == left {
      border-bottom: $width solid $background-color;
      border-right: $height solid $foreground-color;
      border-top: $width solid $background-color;
    }
  } @else if ($direction == up-right) or ($direction == up-left) {
    border-top: $height solid $foreground-color;

    @if $direction == up-right {
      border-left:  $width solid $background-color;
    } @else if $direction == up-left {
      border-right: $width solid $background-color;
    }
  } @else if ($direction == down-right) or ($direction == down-left) {
    border-bottom: $height solid $foreground-color;

    @if $direction == down-right {
      border-left:  $width solid $background-color;
    } @else if $direction == down-left {
      border-right: $width solid $background-color;
    }
  } @else if ($direction == inset-up) {
    border-color: $background-color $background-color $foreground-color;
    border-style: solid;
    border-width: $height $width;
  } @else if ($direction == inset-down) {
    border-color: $foreground-color $background-color $background-color;
    border-style: solid;
    border-width: $height $width;
  } @else if ($direction == inset-right) {
    border-color: $background-color $background-color $background-color $foreground-color;
    border-style: solid;
    border-width: $width $height;
  } @else if ($direction == inset-left) {
    border-color: $background-color $foreground-color $background-color $background-color;
    border-style: solid;
    border-width: $width $height;
  }
}

// demo the mixin
.triangle {
  @include triangle(100px, #bada55, down);
}

.triangle-2 {
  @include triangle(100px, #bada55, right);
}

.triangle-3 {
  @include triangle(100px 50px, #bada55 #000000, up-left);
}

// styles for le demo
body{
  margin: 50px;
}
div {
  float: left;
  margin: 50px;
}
            
          
!
999px
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