details {
    background-color: rgba(0,0,0,0.03);
    margin-bottom: 1.5rem;
    padding: 1rem;
}

summary {
    font-weight: bold;
    cursor: pointer;
}

details[open] {
    background-color: rgb(239,239,239);
}

details[open] summary {
    margin-bottom: 1.2em;
}