details {
    margin: 0 auto;
    background: #aeaeae;
    overflow: hidden;
}

summary {
    padding: 0.5rem;
    display: block;
    background: #fff;
    padding-right: 2.2rem;
    position: relative;
    cursor: pointer;
}

    summary:before {
        content: "";
        border-width: 0.4rem;
        border-style: solid;
        border-color: transparent transparent transparent #333;
        position: absolute;
        top: 0.85rem;
        right: 1rem;
        transform: rotate(180deg);
        transform-origin: 0.2rem 50%;
        transition: 0.25s transform ease;
    }

    summary.leafElement:before {
        display: none;
    }

details[open] > summary:before {
    transform: rotate(90deg);
}

details summary::-webkit-details-marker {
    display: none;
}

details > ul {
    margin-bottom: 0;
    background: var(--light);
}

    details > ul > li {
        display: block;
        background: #fff;
        overflow: hidden;
        padding-right: 1rem;
        position: relative;
        cursor: pointer;
        margin-right: 2px;
    }

    details > ul > li {
        padding: 0.5rem;
        padding-right: 2rem;
    }

.colorView {
    height: 15px;
    width: 15px;
    border-radius: 50%;
    display: inline-block;
    float: left;
    border: 1px solid #555
}