Gravity Wiz Redesign: Sticky Scrollbar

sticky-scrollbar.css

.table-of-contents {
    position: sticky;
    top: 2.25rem;
    overflow-y: auto;
    max-height: calc(100vh - 2.25rem);
    margin-top: 2.25rem;
    padding-bottom: 2.25rem;
    box-sizing: border-box;
}

.table-of-contents a.active {
    color: rgb(144 46 239) !important;
}

.table-of-contents::-webkit-scrollbar {
    width: .25rem;
}

.table-of-contents::-webkit-scrollbar-track {
    appearance: none;
}

.table-of-contents::-webkit-scrollbar-thumb {
    border-radius: 3px;
    background-color: transparent;
}

.table-of-contents:hover::-webkit-scrollbar-thumb,
.table-of-contents:focus::-webkit-scrollbar-thumb {
    background-color: #aaa;
}

sticky-scrollbar.js

// Run this in Chrome DevTools. This is obviously just for PoC and you wouldn't load the script like this.
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = 'https://cdnjs.cloudflare.com/ajax/libs/simple-scrollspy/2.4.0/simple-scrollspy.min.js';
document.head.appendChild(script);

setTimeout(() => {
    scrollSpy('.table-of-contents', {
        sectionClass: '.content [id]',
        enableLocationHash: false,
        threshold: 1,
        onActive: (el) => {
            el.scrollIntoViewIfNeeded();
        }
    });
}, 1000);