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How to set the background for a fenced code block?


How do I set the background for a fenced code block to look something like this?

code block

I tried adding the following custom CSS, but this only highlighted the text, but didn't change the background of the whole block.

.cm-fenced-code {
  background: #E6E6E6;

Anybody has a suggestion how to do this?

Thanks in advance,


  • This is not possible on a pure CSS basis, some changes are needed to the core, but there's already an issue over at GitHub. Simply stay tuned when this gets closed!

  • body #editor .code-block-line {
      background: #001d35;
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