font-family-system-ui/index.css

Poor man's `font-family: system-ui` implementation

.u-font-family-system-ui {
    font-family: system-ui, -apple-system, BlinkMacSystemFont,
        "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell",
        "Fira Sans", "Droid Sans", "Helvetica Neue",
        sans-serif;
}