content: import React from 'react';
  import Box from '@material-ui/core/Box';
  
  export default function FlexGrow() {
    return (
      <div style={{ width: '100%' }}>
        <Box display="flex" p={1} bgcolor="background.paper">
          <Box p={1} flexGrow={1} bgcolor="grey.300">
            Item 1
          </Box>
          <Box p={1} bgcolor="grey.300">
            Item 2
          </Box>
          <Box p={1} bgcolor="grey.300">
            Item 3
          </Box>
        </Box>
      </div>
    );
  }
  