Code background-color overwritten

[GauntletPL]

When using source highlighter like highlightjs, background-color property for code tag is not displayed properly (by this I mean, it does not use highlightjs styles), because of this line ((snippet below is taken from fedora theme))
code{color:var(--white);background-color: var(--highlightcolor) !important}

I suggest changing it to something similar to how it is defined in asciidoctor.css
:not(pre)>code{color:var(--white);background-color: var(--highlightcolor)}

[dohliam]

@GauntletPL Thanks for looking into this! Would you be interested in opening a PR to fix this? If so, we'd be happy to merge it!

[GauntletPL]

@9ao9ai9ar please, go ahead.