What does the CssBaseline class do?

Question

CssBaseline is sort of css reset added to the <head /> of your document. If you are familiar with similar approaches like normalize.css which adds some default visual styling to default elements, resets paddings and etc …

Material-UI provides some reset styles as you can observe here CssBasline.js mainly box-sizing and body font color and background color

 '@global': {
      html: {
        WebkitFontSmoothing: 'antialiased', // Antialiasing.
        MozOsxFontSmoothing: 'grayscale', // Antialiasing.
        // Change from `box-sizing: content-box` so that `width`
        // is not affected by `padding` or `border`.
        boxSizing: 'border-box',
      },
      '*, *::before, *::after': {
        boxSizing: 'inherit',
      },
      'strong, b': {
        fontWeight: 'bolder',
      },
      body: {
        margin: 0, // Remove the margin in all browsers.
        color: theme.palette.text.primary,
        ...theme.typography.body2,
        backgroundColor: theme.palette.background.default,
        '@media print': {
          // Save printer ink.
          backgroundColor: theme.palette.common.white,
        },
      },

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