Fullscreen.js

import React, { PropTypes, Component, cloneElement, Children } from 'react';
import classNames from 'classnames';
import styles from './Fullscreen.scss';

export default class Fullscreen extends Component {

  static propTypes = {
    children: PropTypes.node,
    scroll: PropTypes.boolean
  };

  render() {
    const { children, scroll } = this.props;

    return (
      <div className={classNames(styles.main, {styles.scroll: scroll})}>
        {children}
      </div>
    );
  }
}

fullscreen.scss

.main {
  position: fixed;
  z-index: 100;
  width: 100%;
  height: 100%;
}

.scroll {
  overflow-y: true;
}