.secondary-nav {
    min-width: 200px;
    padding: 2em 2em 0 0;
    background-color: lighten($grey-lighter, 8%);

    &__list {
        padding: 0;
        margin: 0;
        list-style-type: none;
        font-size: 0.8rem;

        &-item {
            a {
                display: block;
                padding: 1em;
                border-top-right-radius: 3px;
                border-bottom-right-radius: 3px;
                color: black;
                text-decoration: none;

                &:hover { background-color: $grey-lighter; }

                &.is-active {
                    background-color: $blurple;
                    color: white;
                }
            }
        }
    }
}

.secondary-nav {
    position: relative;
    min-width: 200px;
    padding: 2em 0 0;
    border-right: 1px solid $grey-light;
    background-color: $grey-lighter;

    &__list {
        padding: 0;
        margin: 0;
        list-style-type: none;
        font-size: 0.8rem;

        &-item {
            a {
                position: relative;
                display: block;
                padding: 1em;
                color: black;
                text-decoration: none;

                &:hover { background-color: $grey-light; }

                &.is-active {
                    background-color: $grey-light;

                    &::after {
                        content: '';
                        position: absolute;
                        z-index: 2;
                        top: 50%;
                        right: -1px;
                        transform: translateY(-50%);
                        @include triangle(left, 8px, white);
                    }

                    &::before {
                        content: '';
                        position: absolute;
                        z-index: 1;
                        top: 50%;
                        right: 0;
                        transform: translateY(-50%);
                        @include triangle(left, 8px, darken($grey-light, 5%));
                    }
                }
            }
        }
    }
}

Add arrows to secondary nav
:hamburger: Add arrows to secondary nav
