.study-toc{

    position:sticky;
    top:65px;
    z-index:999;

    background:#fff;
    border-bottom:1px solid #ddd;

    margin-bottom:20px;

}

.study-toc-scroll{

    display:flex;

    overflow-x:auto;

    gap:10px;

    white-space:nowrap;

    padding:10px;

    scrollbar-width:none;

}

.study-toc-scroll::-webkit-scrollbar{

    display:none;

}

.study-toc a{

    display:inline-block;

    padding:8px 16px;

    background:#f2f2f2;

    border-radius:25px;

    color:#333;

    text-decoration:none;

    font-size:14px;

    transition:.2s;

}

.study-toc a:hover{

    background:#0d6efd;

    color:white;

}

.study-toc a.active{

    background:#0d6efd;

    color:white;

}