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Substack: sticky table of contents

Pins the table of contents alongside the text so you can jump to sections without scrolling up.

Code to copy

/* Stick the table-of-contents sidebar in view while scrolling */
.post-toc,
.table-of-contents,
[class*="tableOfContents"],
[class*="postToc"],
aside nav[aria-label*="contents" i] {
  position: sticky !important;
  top: 16px !important;
  align-self: flex-start !important;
  max-height: calc(100vh - 32px) !important;
  overflow-y: auto !important;
}

How to use this example

1. Copy the code with the button above.
2. Install JustZix (2 minutes) and open the extension on the target page.
3. Add a new rule matching that page.
4. Paste the code into the rule's CSS panel and save — the effect appears instantly.