.tnotebook .frame.tab-content {
    border: 1px solid #c1c1c1;
    padding: 12px;
}

.tnotebook .nav.nav-tabs {
    border: unset;
}

.tnotebook .nav.nav-tabs .nav-item .nav-link {
    margin-right: 5px;
    padding: 4px 8px;
    border-radius: unset;
}

.tnotebook .nav.nav-tabs .nav-item .nav-link:not(.active) {
    background-color: whitesmoke;
    color: #c1c1c1;
    margin-top: -1px;
}

.tnotebook .nav.nav-tabs .nav-item .nav-link:not(.active):hover {
    color: #444;
}

.tnotebook .nav.nav-tabs .nav-item .nav-link.active {
    border-color: #c1c1c1;
    border-bottom: unset;
    margin-top: 1px;
}