@mixin triangle($size, $color, $direction) {
height: 0;
width: 0;
border-color: transparent;
border-style: solid;
border-width: $size / 2;
@if $direction == up {
border-bottom-color: $color;
} @else if $direction == right {
border-left-color: $color;
} @else if $direction == down {
border-top-color: $color;
} @else {
border-right-color: $color;
}
}
.next {
@include triangle(5px, black, right);
}