.bs23-menu-accordion ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.bs23-menu-accordion li {
    position: relative;
}

.bs23-menu-accordion .sub-menu {
    display: none;
}

.bs23-menu-accordion .sub-menu.is-open {
    display: block;
}

.bs23-menu-accordion__toggle {
    position: absolute;
    top: 0;
    right: 0;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border: 0;
    background: transparent;
    color: currentColor;
    cursor: pointer;
}

.bs23-menu-accordion__icon {
    display: block;
    width: .65em;
    height: .65em;
    border-right: .12em solid currentColor;
    border-bottom: .12em solid currentColor;
    transform: rotate(45deg) translateY(-.15em);
    transition: transform .2s ease;
}

.bs23-menu-accordion__toggle[aria-expanded="true"] .bs23-menu-accordion__icon {
    transform: rotate(225deg) translateY(-.15em);
}