windows-ui-fabric/dist/config/app-config.css

Build Windows Fluent UI apps using Html, CSS & JavaScript. Comes with Rich Native Like Components.

:root {
  --PrimaryColor: #0078D7; /* Change of your choice */
  --PrimaryColorLight: #60CDFF; /* Lighter version of --PrimaryColor for DarkMode */
}
body {
  font-family: "Segoe UI";
}

[data-theme="dark"] ::selection {
  background-color: #2E517E;
}