Recommended way to change fonts about arwes HOT 2 CLOSED

const myTheme = {
  typography: {
    headerFontFamily: '"Electrolize", "sans-serif"',
    fontFamily: '"Titillium Web", "sans-serif"'
  }
};

const App = () => (
  <ThemeProvider theme={createTheme(myTheme)}>
    ...
  </ThemeProvider>
);