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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <div class="wrapper"></div>
            
          
!
            
              html, body {
  background-image: url('http://i.imgur.com/NgtPeBa.jpg');
  background-size: cover;
  background-position: center;
  color: #fff;
  height: 100%;
}

.wrapper {
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  
  .card {
    background-color: #fff;
    color: #333;
    padding: 15px;
    border: 1px solid #e9e9e9;
    border-bottom-color: #d5d5d5;
    border-bottom-width: 2px;
    border-radius: 4px;
    
    h3 {
      text-transform: uppercase;
      font-family: impact;
      text-align: center;
      
      &.highlight {
        color: #fB5b77;
      }
    }
  }
}

.hide {
  display: none;
}

.spinner {
  text-align: center;
}
            
          
!
            
              class Child extends React.Component {
  constructor(props) {
    super(props);
    
    this.state = {
      spinner: false
    }
  }
  
  // Accepts nextProps as its argument and allows you to draw comparrisons
  // between the current set of props and the props that are about to be used
  // when the component re-renders, setting state here doesn't trigger a re-render.
  componentWillReceiveProps(nextProps) {
    if (this.props.name !== nextProps.name) {
      // We call an internal method that starts an animation for our loading icon.
      this.preperationAnimation();
    } else {
      console.log('Props have not changed');
    }
  }
  
  // Sets the state of spinner to true so we can bring it in to view.
  preperationAnimation() {
    this.setState({ spinner: true })
  }
  
  render() {
    return (
      <div className={this.state.spinner ? 'spinner' : 'hide'}>
        <i className="fa fa-cog fa-spin fa-3x fa-fw"></i>
        <h3>
          I have detected an incoming change in props!
        </h3>
      </div>
    );
  }
}

class Parent extends React.Component {
  constructor(props) {
    super(props)
    
    this.state = {
      name: 'Montezuma'
    }
  }
  
  // In this example we set the state of 'name' to be one value in the constructor
  // and then immediatly change it when the component mounts and pass it into props.
  //  This will trigger componentWillRecieveProps on the child component.
  componentDidMount() {    
    this.setState({ name: 'Bianca' })
  }
  
  
  render() {
    return (
      <div className="card">
       <Child name={this.state.name} />
      </div>
    );
  }
}


ReactDOM.render(<Parent />, document.querySelector(".wrapper"));

            
          
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