.accordion-content
{
    border-bottom: 1px solid #eee;
    padding-left: 33px;
    padding-bottom: 8px;
}

.tn-elem:has(.tn-tab.selected) .tn-atom {
    background-color: #FFFFFF !important;
    border-bottom-width: 2px;
    border-color: #FF0000 !important;
}