.breadcrumb a, .breadcrumb li {
    color: white;
}
.breadcrumb a:hover {
    color: rgb(196, 196, 196);
}
.toc .level2 > li {
    margin-top: 6px;
}
.expand-stub {
    color: #333333;
}
.affix > ul.level1 {
    overflow: scroll;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE 10+ */
}
::-webkit-scrollbar {
    width: 0px;
    background: transparent; /* make scrollbar transparent */
}