• More on CSS Transitions: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Transitions/Using_CSS_transitions
• More on CSS Animations: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Animations/Using_CSS_animations
• More on ReactTransitionGroup: https://github.com/reactjs/react-transition-group
• Alternative => React Motion: https://github.com/chenglou/react-motion
• Alternative => React Move: https://github.com/react-tools/react-move
• Animating Route Animations: https://github.com/maisano/react-router-transition