.jumbotron {
    background-color: transparent;
}

li {
    margin: 10px 0 10px 0;
}

.b-bar-vertical-inline.b-bar-dark, .b-bar-vertical-popout.b-bar-dark, .b-bar-vertical-small.b-bar-dark {
    background: #007bff;
    color: var(--b-bar-dark-color, rgba(255, 255, 255, 0.5));
}

ul  > li > .nav-link {
    color: #495057;
    background-color: #dee2e6;
    border-color: #dee2e6 #dee2e6 #fff;
}
.nav-tabs .nav-item.show .nav-link, .nav-tabs .nav-link.active {
    color: #f8f9fa;
    background-color: rgb(0 123 255 / 42%);
    border-color: #dee2e6 #dee2e6 #fff;
    font-weight: bold;
}
.nav-tabs .nav-link {
    border: 1px solid #999;
    border-top-left-radius: .25rem;
    border-top-right-radius: .25rem;
}