index.css

.bordered-component-root div {
  box-shadow: inset 0 0 0 1px yellow;
}

index.js

import "./index.css";
import Component from 'react-pure-render/component';
import React from 'react';

/**
 * Wraps a component with a CSS class that makes all divs within it to have an
 * yellow inset border.
 */

export default borderedComponent(Comp) {
  class BorderedComponentWrapper extends Component {
    render() {
      return (
        <div className="bordered-component-root">
          <Comp {...this.props} />
        </div>
      );
    }
  }

  return BorderedComponentWrapper;
}