old_contents: import React from 'react';
  import BannerActionCreators from 'actions/BannerActionCreators';
  
  class Banner extends React.Component {
    constructor(props) {
      super(props);
  
      if (window.localStorage.getItem('banner_jump') === null) {
        BannerActionCreators.show();
      }
    }
  
    onClose = () => {
      BannerActionCreators.hide();
    };
  
    onJump = (os) => {
      BannerActionCreators.jump(os);
      this.onClose();
    };
  
    render() {
      return (
        <section className="banner">
          <p>
            Welcome to <b>Actor Network</b>! Chech out our <a href="//actor.im/ios" onClick={this.onJump.bind(this, 'IOS')} target="_blank">iPhone</a> and <a href="//actor.im/android" onClick={this.onJump.bind(this, 'ANDROID')} target="_blank">Android</a> apps!
          </p>
          <a className="banner__hide" onClick={this.onClose}>
            <i className="material-icons">close</i>
          </a>
        </section>
      );
    }
  }
  
  export default Banner;
  
new_contents: import React from 'react';
  import BannerActionCreators from 'actions/BannerActionCreators';
  
  class Banner extends React.Component {
    constructor(props) {
      super(props);
  
      if (window.localStorage.getItem('banner_jump') === null) {
        BannerActionCreators.show();
      }
    }
  
    onClose = () => {
      BannerActionCreators.hide();
    };
  
    onJump = (os) => {
      BannerActionCreators.jump(os);
      this.onClose();
    };
  
    render() {
      return (
        <section className="banner">
          <p>
            Welcome to <b>Actor Network</b>! Check out our <a href="//actor.im/ios" onClick={this.onJump.bind(this, 'IOS')} target="_blank">iPhone</a> and <a href="//actor.im/android" onClick={this.onJump.bind(this, 'ANDROID')} target="_blank">Android</a> apps!
          </p>
          <a className="banner__hide" onClick={this.onClose}>
            <i className="material-icons">close</i>
          </a>
        </section>
      );
    }
  }
  
  export default Banner;
  
subject: Update Banner.react.js