syntax coloring for code doesn't work

[arnaud-carre]

Hi!
I forked your repo to create a blog about code. I modifyed the config file , adding

markdown: kramdown
highlighter: rouge
kramdown:
input: GFM

In a .md new post file, I use the syntax with three ` producing:

some code...

when looking at github "md" preview page, the code snippet has some colors. But when looking to the deployed github pages, the code is using "fixed size font" (as expected for a code block) but doesn't have any color.

Any hint to fix that?

[hojongs]

Same problem here.