The background color of code blocks (syntax highlighting) do not change when I change the chroma style

Following this, I am trying to change the "style" in config.yml of the syntax highlighting by changing the style (e.g. abap, colorful like here from the default (monokai)), but only the color of font changes and the background color in code block does not change (the color is always black like monokai). Do I miss something? Could anyone kindly tell me what is wrong?

I am using the following setting.

params:
    assets:
        disableHLJS: true

markup:
    goldmark:
        renderer:
            unsafe: true
    highlight:
        #anchorLineNos: true
        codeFences: true
        guessSyntax: true
        lineNos: false
        #noClasses: false
        style: abap