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              <div class="text-center">
<h1>Ultimate arrow mixin (sass)</h1>
  
  <pre class="use-spec">@include arrow($side, $align, $size, $color, $borderColor, $borderSize);</pre>
  <p>Note: You need to add a position attribute (other than static/inherited) to the element you want a arrow on, in order to position the arrow correctly.</p>
</div>
<br/><br/>
<div class="gist-group">
<script src="https://gist.github.com/kirkas/9560076.js"></script>
</div>
<div class="box-group text-center">
<div class="box arrow-top-left"><span>top, left</span></div>
<div class="box arrow-top-center"><span>top, center</span></div>
<div class="box arrow-top-right"><span>top, right</span></div>
<div class="box-with-border arrow-top-left"><span>top, left, border</span></div>
<div class="box-with-border arrow-top-center"><span>top, center, border</span></div>
<div class="box-with-border arrow-top-right"><span>top, right, border</span></div>
<br/>
<div class="box arrow-bottom-left"><span>bottom, left</span></div>
<div class="box arrow-bottom-center"><span>bottom, center</span></div>
<div class="box arrow-bottom-right"><span>bottom, right</span></div>
<div class="box-with-border arrow-bottom-left"><span>bottom, left, border</span></div>
<div class="box-with-border arrow-bottom-center"><span>bottom, center, border</span></div>
<div class="box-with-border arrow-bottom-right"><span>bottom, right, border</span></div>
<br/>
<div class="box arrow-left-top"><span>left, top</span></div>
<div class="box arrow-left-center"><span>left, center</span></div>
<div class="box arrow-left-bottom"><span>left, bottom</span></div>
<div class="box-with-border arrow-left-top"><span>left, top, border</span></div>
<div class="box-with-border arrow-left-center"><span>left, center, border</span></div>
<div class="box-with-border arrow-left-bottom"><span>left, bottom, border</span></div>
<br/>
<div class="box arrow-right-top"><span>right, top</span></div>
<div class="box arrow-right-center"><span>right, center</span></div>
<div class="box arrow-right-bottom"><span>right, bottom</span></div>
<div class="box-with-border arrow-right-top"><span>right, top, border</span></div>
<div class="box-with-border arrow-right-center"><span>right, center, border</span></div>
<div class="box-with-border arrow-right-bottom"><span>right, bottom, border</span></div>


</div>
            
          
!
            
              /************
 Mixin
************/
@mixin arrow_helper($arrowSize, $arrowColor, $margin, $side, $align) {
  @if $side == "top" {
    border-bottom-color: $arrowColor;
    top: -2 * $arrowSize;
  }
  @if $side == "bottom" {
    border-top-color: $arrowColor;
    bottom: -2 * $arrowSize;
  }
  @if $side == "left" {
    border-right-color: $arrowColor;
    left: -2 * $arrowSize;
  }
  @if $side == "right" {
    border-left-color: $arrowColor;
    right: -2 * $arrowSize;
  }
  @if $side == "right" or $side == "left" {
    @if $align == "center" {
      top: 50%;
      margin-top: -$arrowSize;
    }
    @else if $align == "top" {
      top: $margin;
    }
    @else if $align == "bottom" {
      bottom: $margin;
    }
  }
  @if $side == "bottom" or $side == "top" {
    @if $align == "center" {
      right: 50%;
      margin-right: -$arrowSize;
    }
    @else if $align == "left" {
      left: $margin;
    }
    @else if $align == "right" {
      right: $margin;
    }
  }
}

@mixin arrow($side: "right", $align: "center", $size: 20px, $color: #f6f6f6, $borderColor: "none", $borderSize: 3px) {
  $selector: "&:after, &:before";
  @if $borderColor == "none" {
    $selector: "&:after";
  }
  #{$selector} {
    border: solid transparent;
    content: " ";
    height: 0;
    width: 0;
    position: absolute;
    pointer-events: none;
    visibility: visible;
  }
  
  &:after {
    border-width: $size;
    @include arrow_helper($size, $color, $size, $side, $align);
  }
  
  @if $borderColor != "none" {
    &:before {
      border-width: $borderSize + $size;
      @include arrow_helper($size + $borderSize, $borderColor, $size - $borderSize, $side, $align);
    }
  }
}

/************
 Use
************/
.box {
  &.arrow-top-left {@include arrow('top','left', 10px, #4fade3)}
  &.arrow-top-right {@include arrow('top','right', 10px, #4fade3)}
  &.arrow-top-center {@include arrow('top','center', 10px, #4fade3)}
  &.arrow-bottom-left {@include arrow('bottom','left', 10px, #4fade3)}
  &.arrow-bottom-right {@include arrow('bottom','right', 10px, #4fade3)}
  &.arrow-bottom-center {@include arrow('bottom','center', 10px, #4fade3)}
  &.arrow-left-top {@include arrow('left','top', 10px, #4fade3)}
  &.arrow-left-center {@include arrow('left','center', 10px, #4fade3)}
  &.arrow-left-bottom {@include arrow('left','bottom', 10px, #4fade3)}
  &.arrow-right-top {@include arrow('right','top', 10px, #4fade3)}
  &.arrow-right-center {@include arrow('right','center', 10px, #4fade3)}
  &.arrow-right-bottom {@include arrow('right','bottom', 10px, #4fade3)}
}


.box-with-border {
  &.arrow-top-left {@include arrow('top','left', 10px, #eee, #4fade3, 6px)}
  &.arrow-top-right {@include arrow('top','right', 10px, #eee, #4fade3, 6px)}
  &.arrow-top-center {@include arrow('top','center', 10px, #eee, #4fade3, 6px)}
  &.arrow-bottom-left {@include arrow('bottom','left', 10px, #eee, #4fade3, 6px)}
  &.arrow-bottom-right {@include arrow('bottom','right', 10px, #eee, #4fade3, 6px)}
  &.arrow-bottom-center {@include arrow('bottom','center', 10px, #eee, #4fade3, 6px)}
  &.arrow-left-top {@include arrow('left','top', 10px, #eee, #4fade3, 6px)}
  &.arrow-left-center {@include arrow('left','center', 10px, #eee, #4fade3, 6px)}
  &.arrow-left-bottom {@include arrow('left','bottom', 10px, #eee, #4fade3, 6px)}
  &.arrow-right-top {@include arrow('right','top', 10px, #eee, #4fade3, 6px)}
  &.arrow-right-center {@include arrow('right','center', 10px, #eee, #4fade3, 6px)}
  &.arrow-right-bottom {@include arrow('right','bottom', 10px, #eee, #4fade3, 6px)}
}


/************
 Css for demo
************/
*, *:before, *:after {
  -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box;
 }
body {
  font-family: 'Helvetica neue';
  padding: 24px;
}

.box-with-border, .box {
  width: 28%;
  height: 100px;
  background: #4fade3;
  margin: 24px;
  display:inline-block;
  position:relative;
  span {
    color: #f1f1f1;
    position:absolute;
    top: 50%;
    -webkit-transform: translateY(-50%);
    -moz-transform: translateY(-50%);
    transform: translateY(-50%);
    width: 100%;
    left: 0;
    text-align:center;
    font-size: 18px;
  }
}

.box-with-border {
  border: 4px solid #4fade3;
  background: #eee;
  span {
    color: #4fade3;
  }
}


.text-center{
  text-align:center;
}
.use-spec {
  background: #f1f1f1;
  display:inline-block;
  padding: 6px 12px;
  font-size: 16px;
  border-radius: 3px;
  margin: 0 auto;
}


.gist-group, .box-group {
  display:inline-block;
  vertical-align: top;
}


.gist-group {width: 40%;}
.box-group {width: 59%;}


            
          
!
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