content: import React from 'react';
  import PropTypes from 'prop-types';
  import Avatar from '@material-ui/core/Avatar';
  import Button from '@material-ui/core/Button';
  import CssBaseline from '@material-ui/core/CssBaseline';
  import FormControl from '@material-ui/core/FormControl';
  import FormControlLabel from '@material-ui/core/FormControlLabel';
  import Checkbox from '@material-ui/core/Checkbox';
  import Input from '@material-ui/core/Input';
  import InputLabel from '@material-ui/core/InputLabel';
  import LockIcon from '@material-ui/icons/LockOutlined';
  import Paper from '@material-ui/core/Paper';
  import Typography from '@material-ui/core/Typography';
  import withStyles from '@material-ui/core/styles/withStyles';
  
  const styles = theme => ({
    main: {
      width: 'auto',
      display: 'block', // Fix IE 11 issue.
      marginLeft: theme.spacing.unit * 3,
      marginRight: theme.spacing.unit * 3,
      [theme.breakpoints.up(400 + theme.spacing.unit * 3 * 2)]: {
        width: 400,
        marginLeft: 'auto',
        marginRight: 'auto',
      },
    },
    paper: {
      marginTop: theme.spacing.unit * 8,
      display: 'flex',
      flexDirection: 'column',
      alignItems: 'center',
      padding: `${theme.spacing.unit * 2}px ${theme.spacing.unit * 3}px ${theme.spacing.unit * 3}px`,
    },
    avatar: {
      margin: theme.spacing.unit,
      backgroundColor: theme.palette.secondary.main,
    },
    form: {
      width: '100%', // Fix IE 11 issue.
      marginTop: theme.spacing.unit,
    },
    submit: {
      marginTop: theme.spacing.unit * 3,
    },
  });
  
  function SignIn(props) {
    const { classes } = props;
  
    return (
      <main className={classes.main}>
        <CssBaseline />
        <Paper className={classes.paper}>
          <Avatar className={classes.avatar}>
            <LockIcon />
          </Avatar>
          <Typography component="h1" variant="h5">
            Sign in
          </Typography>
          <form className={classes.form}>
            <FormControl margin="normal" required fullWidth>
              <InputLabel htmlFor="email">Email Address</InputLabel>
              <Input id="email" name="email" autoComplete="email" autoFocus />
            </FormControl>
            <FormControl margin="normal" required fullWidth>
              <InputLabel htmlFor="password">Password</InputLabel>
              <Input name="password" type="password" id="password" autoComplete="current-password" />
            </FormControl>
            <FormControlLabel
              control={<Checkbox value="remember" color="primary" />}
              label="Remember me"
            />
            <Button
              type="submit"
              fullWidth
              variant="contained"
              color="primary"
              className={classes.submit}
            >
              Sign in
            </Button>
          </form>
        </Paper>
      </main>
    );
  }
  
  SignIn.propTypes = {
    classes: PropTypes.object.isRequired,
  };
  
  export default withStyles(styles)(SignIn);
  