It would be helpful to include the broken link so others can help you search faster.
It looks like you are looking for this 8+8 highlight snippet (https://github.com/steveyang331/Obsidian-css/tree/main/8%2B8%20highlight%20colors) ?
The original poster appears to have deleted their github account.
A quick search of the forum turned up this (see magnifying glass in upper right).
At the bottom of that post are some links.
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8 + 8 highlight colors.css (11.0 KB)
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Combine Nested tag colors and Highlight colors .css (5.6 KB)
That might be what you were looking for?