RSS Feed/News Dark style and EXTRA.css

[ENXF NET]

I have a css in extra.css to show alternating colors for forums in forum list.

What I have to do to have this in two versions for light/dark, please?

CSS:

.node--depth2 {
background:green;   
}
.node--depth2:nth-child(odd) {
background:orange;   
}

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