Global setting of font size ratio in Material UI library

After reviewing the guidance provided in Material's documentation and this helpful response, I have been attempting to establish a default font-size for the html tag in my application. This adjustment is necessary because my app utilizes REM units, while the container it is housed within uses the standard conversion of 1rem = 16px, resulting in design inconsistencies. The configuration of my theme appears as follows:

typography: {
    htmlFontSize: 10,
    ...
},
overrides: {
    MuiCssBaseline: {
      '@global': {
        html: {
          fontSize: '62.5%',
        },
    ...

I anticipated that the generated CSS would include html{font-size:62.5%;}, but it seems to be missing, causing styling issues. Is there a different approach I should take to target the html element?

cssmaterial-uifont-size

Answer №1

I tested out the code you provided and it seems to be working perfectly. Just make sure that you are enclosing your component with ThemeProvider, passing your theme configuration as a prop, and including <CssBaseline />.

const theme = createMuiTheme({
  typography: {
    htmlFontSize: 10
  },
  overrides: {
    MuiCssBaseline: {
      "@global": {
        html: {
          fontSize: "62.5%"
        }
      }
    }
  }
});

export default function App() {
  return (
    <ThemeProvider theme={theme}>
      <CssBaseline />
      <div className="App">
        <h1>Hello CodeSandbox</h1>
        <h2>Start editing to see some magic happen!</h2>
      </div>
    </ThemeProvider>
  );
}

By looking at the styles for the html element, we can confirm that the style font-size: 62.5% is being applied.

https://i.stack.imgur.com/qXVXs.png

https://codesandbox.io/s/nostalgic-hoover-rm7ht?fontsize=14&hidenavigation=1&theme=dark

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