scale-dashboard/less/app.arrow.less

.arrow {
  border-width: @arrow-outer-width;
  z-index: 10;
  &,
  &:after {
    position: absolute;
    display: block;
    width: 0;
    height: 0;
    border-color: transparent;
    border-style: solid;
  }
  &:after{
  	border-width: @arrow-width;
  	content: "";
  }

  &.top {
    left: 50%;
    margin-left: -@arrow-outer-width;
    border-top-width: 0;
    border-bottom-color: @arrow-outer-fallback-color; // IE8 fallback
    border-bottom-color: @arrow-outer-color;
    top: -@arrow-outer-width;
    &:after {
      content: " ";
      top: 1px;
      margin-left: -@arrow-width;
      border-top-width: 0;
      border-bottom-color: @arrow-color;
    }
  }

  &.right {
  	top: 50%;
    right: -@arrow-outer-width;
    margin-top: -@arrow-outer-width;
    border-right-width: 0;
    border-left-color: @arrow-outer-fallback-color; // IE8 fallback
    border-left-color: @arrow-outer-color;
    &:after {
      content: " ";
      right: 1px;
      border-right-width: 0;
      border-left-color: @arrow-color;
      bottom: -@arrow-width;
    }
  }

  &.bottom {
    left: 50%;
    margin-left: -@arrow-outer-width;
    border-bottom-width: 0;
    border-top-color: @arrow-outer-fallback-color; // IE8 fallback
    border-top-color: @arrow-outer-color;
    bottom: -@arrow-outer-width;
    &:after {
      content: " ";
      bottom: 1px;
      margin-left: -@arrow-width;
      border-bottom-width: 0;
      border-top-color: @arrow-color;
    }
  }

  &.left {
  	top: 50%;
    left: -@arrow-outer-width;
    margin-top: -@arrow-outer-width;
    border-left-width: 0;
    border-right-color: @arrow-outer-fallback-color;
    border-right-color: @arrow-outer-color;
    &:after {
      content: " ";
      left: 1px;
      border-left-width: 0;
      border-right-color: @arrow-color;
      bottom: -@arrow-width;
    }
  }

}