text: import * as React from 'react';
  import { makeStyles } from '@material-ui/core/styles';
  import Avatar from '@material-ui/core/Avatar';
  import { deepOrange, green } from '@material-ui/core/colors';
  import AssignmentIcon from '@material-ui/icons/Assignment';
  
  const useStyles = makeStyles((theme) => ({
    root: {
      display: 'flex',
      '& > *': {
        margin: theme.spacing(1),
      },
    },
    square: {
      color: theme.palette.getContrastText(deepOrange[500]),
      backgroundColor: deepOrange[500],
    },
    rounded: {
      color: '#fff',
      backgroundColor: green[500],
    },
  }));
  
  export default function VariantAvatars() {
    const classes = useStyles();
  
    return (
      <div className={classes.root}>
        <Avatar variant="square" className={classes.square}>
          N
        </Avatar>
        <Avatar variant="rounded" className={classes.rounded}>
          <AssignmentIcon />
        </Avatar>
      </div>
    );
  }
  