Animate.js

import React from 'react'
import ReactCSSTransitionGroup from 'react-addons-css-transition-group'

class Animated extends React.Component {
    constructor(){
        super()
        this.state = {

        }
    }
    componentDidMount(){
        setTimeout(() => {
           this.setState({ animate: 'animate' }) 
        }, 2000);
    }
    render(){
        return(
            <div>
                <ReactCSSTransitionGroup
                    transitionName="example"
                    className="animate"
                    component="div"
                    transitionEnterTimeout={20000}
                    transitionLeaveTimeoutTimeout={1000}>
                    <span key={this.state.animate}>{this.state.animate}</span>
                </ReactCSSTransitionGroup>
            </div>
        )
    }
}
export default Animated