I've not spent much time delving into how Splunk Web defines the colors in its style guide:
/en-US/static/docs/style/style-guide.html#colors
but from what I've seen, it doesn't use CSS variables that you can refer to in your own CSS rules in Simple XML.
For example, I'd hoped to be able to do this:
background-color: var(--accentColorL10);
but, nope. For colors, Splunk appears to be using CSS classes, not CSS variables.
I'd be happy to be shown otherwise.
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