Line numbering in code blocks is messy

[Pamplemousse]

By adding

kramdown:                                                                                                                                                                                          
   syntax_highlighter_opts:                                                                                                                                                                         
     block:                                                                                                                                                                                         
       line_numbers: true

to their Jekyll configuration, one can have line numbers displayed in code blocks.

However, I tried this with the cayman theme, and the display is messily overcomplicated. This the following screenshot:

I expected only to see the outermost border.

[Pamplemousse]

Also, note that inlining

{% highlight c linenos %}
...
{% highlight %}

directly in the .md instead of changing the configuration produces the same behavior.

[stale[bot]]

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