Changing the Base Color Setting via CSS

"Invisible" segments use style="fill: var(--nr-dashboard-groupBackgroundColor);"
"visible" segments use style="fill: var(--nr-dashboard-pageTitlebarBackgroundColor);"

So you can override it like this:

Untitled 1

.nr-dashboard-ui_digital_display.visible svg path {
 --nr-dashboard-pageTitlebarBackgroundColor : red;
}

Edit - I don't think you need .visible since it's the entire widget which is visible not individual segments.

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