NotFound.js

import React, { Component } from 'react';
import { Button, Container, Header, Icon, Segment } from 'semantic-ui-react';

export default class NotFound extends Component {
  render() {
    return (
      <div>
        <Segment inverted textAlign='center' vertical>
          <Container>
            <Header
              as='h1'
              content='404 - A keresett oldal nem található!'
              inverted
              style={{
                fontSize: '3em',
                fontWeight: 'normal',
                marginBottom: 0,
                marginTop: '0.5em',
              }}
            />
            <Button
              href='/'
              primary
              size='huge'
              style={{
                fontSize: '2em',
                marginTop: '1em',
                marginBottom: '1em',
              }}
            >
              Vissza a Főoldalra
              <Icon name='right arrow' />
            </Button>
          </Container>
        </Segment>
      </div>
    );
  }
}