details {
    border: 1px solid #dcdcdc;
    border-radius: 4px;
    padding: 1em;
    margin-bottom: 0.6rem;
    background-color: #f9f9f9;
}

summary {
    font-weight: bold;
    cursor: pointer;
    outline: none;
    list-style: none;
    display: flex;
    align-items: center;
}

summary::before {
    content: '›';
    margin-right: 1.5rem;
    font-size: 2em;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: rotate(90deg);
}

details[open] {
    background-color: #ffffff;
}

details[open] summary {
    border-bottom: 1px solid #dcdcdc;
    padding-bottom: 1em;
    margin-bottom: 1em;
}

details[open] summary::before {
    transform: rotate(-90deg) translateY(-3px);
}