.tabbar {
    margin: 1rem 1rem 0 1rem;
    border-bottom: 2px solid transparent;
}

.tabbar ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

.tabbar li {
    display: inline-block;
    margin-right: 20px;
}

.tabbar a {
    text-decoration: none;
    color: #7f8c8d;
    position: relative;
    padding-bottom: 8px;
}

.tabbar a.active {
    font-weight: bold;
    color: black;
}

.tabbar a.active::after {
    content: '';
    display: block;
    width: 100%;
    height: 2px;
    background-color: #f1c40f;
    position: absolute;
    bottom: 0;
    left: 0;
}