@mixin arrow($arrow-direction, $border-color, $background-color, $border-width, $border-size) {
    &:after,
    &:before {
        #{$arrow-direction}: 100%;
        left: 50%;
        border: solid transparent;
        content: " ";
        height: 0;
        width: 0;
        position: absolute;
        pointer-events: none;
    }
    &:after {
        border-color: rgba($background-color, 0);
        border-#{$arrow-direction}-color: $background-color;
        border-width: #{$border-size}px;
        margin-left: -#{$border-size}px;
    }
    &:before {
        border-color: rgba($border-color, 0);
        border-#{$arrow-direction}-color: $border-color;
        border-width: calc(#{$border-size}px + #{$border-width}px);
        margin-left: calc(-#{$border-size}px + #{$border-width}px);
    }
}