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HTML 

              
                <div id="app"></div>
!

CSS 

              
                @import 'https://fonts.googleapis.com/css?family=Noto+Sans'

// Font variables
$main-font: 'Noto Sans', sans-serif

// Color variables
$darkblue: rgba(40, 75, 99, 0.8)
$fadedwhite: rgba(255,255,255,.7)
$accentcolor: #58a4b0
$fbcolor: #3A5A98
$twcolor: #55ACEE

body
  background: radial-gradient(ellipse farthest-corner at center top, #d8dbe2 0%, #a9bcd0 100%)
  height: 100vh
  font-family: $main-font
  background: url('https://hd.unsplash.com/photo-1435777940218-be0b632d06db') no-repeat center center fixed
  
// App style  
.Modal
  position: absolute
  top: 50%
  left: 50%
  transform: translate(-50%, -50%)
  background: $darkblue
  background-size: cover
  border-radius: 5px
  // Lost password style
  & a
    display: block
    color: $fadedwhite
    font-size: 12px
    text-align: center
    text-decoration: none
    margin: 4px 0 10px 0
    margin: 10px
    &:hover
      text-decoration: underline

// Input  
.Input
  display: flex
  // Hack to be able to have a label pseudo element before the input field
  flex-direction: row-reverse
  
  align-items: center
  border-bottom: 1px solid #58a4b0
  margin: 0 20px
  & input
    border: 0
    background: transparent
    padding: 2px 10px
    margin: 18px 4px 0 4px
    color: $fadedwhite
    font-family: $main-font
    font-size: 14px
    
    &:required
      box-shadow: none
    
    // Animation trigger for label::before
    &:focus ~ label
      opacity: 1
    
    // label::before icons
    &[type='text']
      ~ label
        &::before
          content: "\f007"
    &[type='password']
      ~ label
        &::before
          content: "\f023"
      
// Label
label
  font-family: FontAwesome
  color: white
  font-size: 14px
  margin-top: 17px
  transition: opacity .3s ease-in-out
  // pseudo element before input field (see hack above)
  &::before
    padding: 5px 5px 0 0
    opacity: 0.5

// Buttons

// Sign in button
form 
  & button
    position: relative
    margin: 15px 0 5px 0
    left: 50%
    transform: translateX(-50%)
    background: $accentcolor
    border: none
    border-radius: 5px
    padding: 10px
    color: white
    width: 85%
    font-family: $main-font
    font-size: 14px
    cursor: pointer
    
// Social login buttons    
.social-signin
  text-align: center
  & button
    width: 40%
    border: none
    border-radius: 5px
    cursor: pointer
    padding: 10px
    & i
      font-size: 20px
      color: white
    &.fb
      background: $fbcolor
      margin-right: 13px
    &.tw
      background: $twcolor
// modal back button
.bringitback
  position: absolute
  left: 50%
  top: 50%
  transform: translateX(-50%)
  background: $accentcolor
  border: none
  border-radius: 5px
  padding: 10px
  color: white
  width: 200px
  font-family: $main-font
  font-size: 14px
  cursor: pointer 

// Fake logo
.logo
  text-align: center
  color: white
  & i
    display: block
    padding: 20px 0 0 0 
    font-size: 70px
    transform: translateX(-5px)
  & span
    color: $fadedwhite
    text-transform: uppercase
    

// React CSS animations

// On enter
.animation-enter
  opacity: .01
	
  &.animation-enter-active
    opacity: 1
    transition: opacity .6s ease, margin .5s ease
	
// On leave
.animation-leave
  margin-top: 0px
  opacity: 1
  &.animation-leave-active
    margin-top: -30px
    opacity: .01
    transition: opacity .2s ease

// On mount
.animation-appear
  opacity: 0.01
.animation-appear.animation-appear-active 
  opacity: 1
  transition: opacity .5s ease-in
!

JS 

              
                const ReactCSSTG = React.addons.CSSTransitionGroup;

// Main app
class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
        isVisible: true
      }
      // Bindings
    this.handleSubmit = this.handleSubmit.bind(this);
    this.handleRemount = this.handleRemount.bind(this);
  }

  handleSubmit(e) {
    e.preventDefault();
    this.setState({
      isVisible: false
    }, function() {
      console.log(this.state.isVisible)
    });
    return false;
  }
  handleRemount(e) {
    this.setState({
      isVisible: true
    }, function() {
      console.log(this.state.isVisible)
    });
    e.preventDefault();
  }
  render() {

    // const for React CSS transition declaration
    let component = this.state.isVisible ? <Modal onSubmit={ this.handleSubmit } key='modal'/> : <ModalBack onClick={ this.handleRemount } key='bringitback'/>;

    return <ReactCSSTG transitionName="animation" transitionAppear={true} transitionAppearTimeout={500} transitionEnterTimeout={500} transitionLeaveTimeout={300}>
             { component }
           </ReactCSSTG>
  }
}

// Modal
class Modal extends React.Component {
  render() {
    return <div className='Modal'>
              <Logo />
              <form onSubmit= { this.props.onSubmit }>
                <Input type='text' name='username' placeholder='username' />
                <Input type='password' name='password' placeholder='password' />
                <button> Sign In</button>
              </form>
              <div className='social-signin'>
                <button className="fb" onClick={ this.props.onClick }><i className="fa fa-facebook" aria-hidden="true"></i></button>
                <button className="tw" onClick={ this.props.onClick }><i className="fa fa-twitter" aria-hidden="true"></i></button>
              </div>
                <a href='#'>Lost your password ?</a>
           </div>
  }
}

// Generic input field
class Input extends React.Component {
  render() {
    return <div className='Input'>
              <input type={ this.props.type } name={ this.props.name } placeholder={ this.props.placeholder } required autocomplete='false'/>
              <label for={ this.props.name } ></label>
           </div>
  }

}

// Fake logo
class Logo extends React.Component {
  render() {
    return <div className="logo">
                <i className="fa fa-bug" aria-hidden="true"></i> 
                <span> awesome logo </span>
              </div>
  }
}

// Button to brind the modal back
class ModalBack extends React.Component {
  render() {
    return <button className="bringitback" onClick={ this.props.onClick } key={ this.props.className }>Brind the modal back !</button>
  }
}

ReactDOM.render(<App />, document.getElementById('app'));
!
999px

Console