.AdminCollapsibleHeader {
    background-color: lightGrey;
}

    .AdminCollapsibleHeader .card-title {
        margin-bottom: 0px;
    }

    .AdminCollapsibleHeader a,
    .AdminCollapsibleHeader a:hover,
    .AdminCollapsibleHeader a:focus,
    .AdminCollapsibleHeader a[aria-expanded="true"] {
        color: black;
    }