The sidebar currently used on the website version of CSFG causes issues when the table of contents is quite long, see the image below. Use the Pushpin feature within MaterializeCSS (emulates the CSS sticky positioning) to stop pinning the item within specified ranges. This occurs on all browsers.
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If this is a code related issue, please include the following in your description:
Position sidebar with sticky-kit.js (fixes #387)
The sidebar is now positioned by floating
within the parent element, so the JS library
can detect when the element reaches the
bottom of the element.