I love how I can embed GitHub Gists in my blog posts, but really dislike how they use 8 spaces for tabs by default. I found a solution in an old GitHub issue thread here.

Simply add this CSS to the Blog Header in the Code Injection section in Settings. Works like a charm.

As an aside, if you don’t like the look of the Gist footer bar, it can be removed by adding the following to the same section (CSS gleaned from this StackOverflow thread).

That footer is simply too noisy for my taste, and distracts from the content.