.toggle-container .toggle-trigger::before {
    content: ' ';
    display: inline-block;

    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
    border-left: 5px solid currentColor;

    vertical-align: middle;
    margin-right: .7rem;
    transform: translateY(-2px);

    transition: transform .2s ease-out;
}
.toggle-container.toggle-open .toggle-trigger::before {
    transform: rotate(90deg) translateX(-3px);
}