Dev tools (but scanning github would work too).
Dark theme:
:root {
--nr-dashboard-pageBackgroundColor: #111111;
--nr-dashboard-pageTitlebarBackgroundColor: #097479;
--nr-dashboard-groupTextColor: #0eb8c0;
--nr-dashboard-groupBackgroundColor: #333333;
--nr-dashboard-groupBorderColor: #555555;
--nr-dashboard-widgetTextColor: #eeeeee;
--nr-dashboard-widgetBackgroundColor: #097479;
--nr-dashboard-widgetBorderColor: #333333;
--nr-dashboard-widgetColor: #097479;
--nr-dashboard-widgetBgndColor: #333333;
}
Light theme:
:root {
--nr-dashboard-pageBackgroundColor: #fafafa;
--nr-dashboard-pageTitlebarBackgroundColor: #0094CE;
--nr-dashboard-groupTextColor: #1bbfff;
--nr-dashboard-groupBackgroundColor: #ffffff;
--nr-dashboard-groupBorderColor: #ffffff;
--nr-dashboard-widgetTextColor: #111111;
--nr-dashboard-widgetBackgroundColor: #0094ce;
--nr-dashboard-widgetBorderColor: #ffffff;
--nr-dashboard-widgetColor: #0094ce;
--nr-dashboard-widgetBgndColor: #ffffff;
}