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HTML

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

CSS

              
                $background: #F1F1F1;
$header-color: #666666;

html, body {
  background: $background;
  font-family: roboto;
}

* {
  font-family: roboto;
  font-weight: 300;
}

// @keyframes flipBack {
//   0% {
//     transform: rotateY(180deg);
//   }
//   100% {
//     transform: rotateY(0deg);
//   }
// }

* {
  position: relative;
}

.wrapper {
  width: 100%;
  height: 100vh;
}
.content-wrapper {
  display: flex;
  height: 93vh;
  justify-content: center;
  align-items: center;
  background: $background;
  margin: 0 auto;
  padding: 0 2em;
}

.card  {
  width: 30em;
  height: 15em;
  display: flex;
  justify-content: center;
  align-items: center;
  background: white;
  box-shadow: 2px 3px 23px rgba(0,0,0,.1);
  padding: 1em 3em;
	transform-style: preserve-3d;
  margin-top: 4em;
  transition: 0.2s;
  
  &.back {
  
  }
  
  @media(max-width: 600px) {
    width: 25em;
  }
  
  @media(max-height: 823px) {
    margin-top: 9em;
  }
}

.card__flip-card {
  position: absolute;
  top: 4%;
  right: 5%;
  cursor: pointer;
  color: #333;
}

.card__counter {
  position: absolute;
  left: 5%;
  top: 5%;
}

.card__content--front {
  animation: fadeInUp 0.5s;
  font-weight: bold;
}

.card__content--back {
  animation: fadeIn 0.6s;
  line-height: 1.5;
  font-size: 14px;
}

.header {
  background: white;
  box-shadow: 7px 7px 22px lightgray;
  padding: 1em 0em;
  display: flex;
  align-items: center;
  height: 3vh;
  color: $header-color;
  position: absolute;
  width: 100%;
  z-index: 1;
}

.header-content {
  width: 33.33%;
  display: flex;
  justify-content: center;
  font-weight: 400;
  
  span {
    font-size: 1.3em;
    cursor: pointer
  }
}

.header-content__right {
  justify-content: flex-end;
   z-index: 11;
}

.header-content__left {
  justify-content: flex-start;
  
  span {
    margin-left: 1em;
  }
}

//create-card


.create-card {
  bottom: 0;
  left: 0;
  position: fixed;
  right: 0;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: center;
  align-items: center;
}
.create-card__shadow {
  bottom: 0;
  left: 0;
  position: fixed;
  right: 0;
  top: 0;
  background: rgba(0,0,0,0.5);
  z-index: 101;
  height: 100%;
  width: 100%;
  transition: 0.5s;
 
}

.create-card__body {
  position: absolute;
  height: 20em;
  width: 30em;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  animation: fadeIn 0.5s;
  text-align: center;
  box-shadow: inset 0px 0px 0px 3px gray;
  outline: 4px solid white;
  left: 50%;
  top: 50%;
  transform: translateX(-50%)translateY(-50%);
  
  h1 {
    font-size: 1.3em;
    margin-top: 2.5em;
    color: #333;
  }
}

.create-card__placeholder {
  transition: 0.2s;
}

.create-card__input-wrapper {
  text-align: center;
  input {
    margin: 0.75em 0;
    padding: 0.5em 1em;
    width: 70%;
  }
}

#create-card__button {
  border: 1px solid;
  background: white;
  color: #333;
  cursor: pointer;
  margin-top: 1.75em;
  padding: 0.5em 0.75em;
  
  &:focus {
    outline: none;
  }
}

.create-card__error {
  color: tomato;
  margin-top: 1em;
}

.card-container__icon {
  position: fixed;
  z-index: 100;
  font-size: 1.5em;
  top: 0.5em;
  left: 94%;
  transform: translateX(-50%);
  cursor: pointer;
  color: #333;
}

.card__actions {
  position: absolute;
  bottom: 10%;
  display: flex;
  width: 100%;
  justify-content: center;
  opacity: 0;
  transition: 0.3s;
  left: 0;
  
  &.active {
    opacity: 1;
  }
}

.card__next-button {
  margin-left: 0.5em;
  cursor: pointer;
  padding: 0.5em 0.75em;
  background: $background;
  color: #444;
  transition: 0.2s;
  
  &:hover {
    background: darken($background, 10%);
  }
}

.card__prev-button {
  margin-right: 0.5em;
  cursor: pointer;
  padding: 0.5em 0.75em;
  background: $background;
  color: #444;
  transition: 0.2s;
  
  &:hover {
    background: darken($background, 10%);
  }
}

.card-container__dot {
  margin: 0 1em;
}

.card-container__dots-wrapper {
  padding: 1em 0em;
  margin-top: 1em;
  text-align: center;
  
}

.card-container__dot {
  color: lightgray;
  cursor: pointer;
  
  &.active {
    color: dodgerblue;
    transition: 0.5s;
  }
}
              
            
!

JS

              
                
class CreateCard extends React.Component {
  constructor() {
    super();
    this.state = {
      word: '',
      description: '',
      showError: false
    }
  }
    
  hideError() {
    this.setState({showError: !this.state.showError});
  }
  
  render() {
    const errorMessage = this.state.showError ? 'Please fill in the word and description!' : '';
    return (
      <div className='create-card'>
        <div 
          className='create-card__shadow'
          onClick={() => {
            this.props.onShadowClick();
          }}
        >
        </div>
        <div className='create-card__body'>
          <h1>Create New Card</h1>
          <div className='create-card__input-wrapper'>
            <input 
              id='word' 
              placeholder="Word i.e. 'React'"
              value = {this.state.word}
              onChange = {(e) => this.setState({word: e.target.value})}
            />
            <input 
              id='description' 
              placeholder="Description i.e. 'A front end js framework.'"
              value = {this.state.description}
              onChange = {(e) => this.setState({description: e.target.value})}
            />
            <br/>
            <button 
              id='create-card__button'
              onClick={() => {
               
                if (this.state.word.length === 0 || this.state.description.length === 0) {
                  this.setState({showError: !this.state.showError});
                  setTimeout(() => this.hideError(), 2000);
                } else {
                  this.props.onShadowClick();
                  const word = new Immutable.Map({word: this.state.word, description: this.state.description});
                  this.props.onCreateCard(word);  
                }
              }}
            >
                Create!
            </button>
            <div className='create-card__error'>
              {errorMessage}
            </div>
          </div>
        </div>
      </div>
    );
  }
}

class Header extends React.Component {
  constructor() {
    super();
    this.state = {
      showModal: false
    }
  }
   
  render() {
    return (
      <div className='header'>
        <div className='header-content header-content__left'>
          
        </div>
        <div className='header-content header-content__middle'>
          Flash Cards
        </div>
        <div className='header-content header-content__right'>
          
        </div>
      </div>
    )
  }
}
class Card extends React.Component {
  
  constructor() {
    super();
    this.state = {
      showAnswer: false
    }
  }
 
  render() {
    const content = this.state.showAnswer ? this.props.backContent : this.props.frontContent;
    const iconClass = this.state.showAnswer ? 'reply' : 'share';
    const cardClass = this.state.showAnswer ? 'back' : '';
    const contentClass = this.state.showAnswer ? 'back' : 'front';
    const actionClass = this.state.showAnswer ? 'active' : '';

    return (
      <div 
        className={`card ${cardClass}`}
        onClick={() => this.setState({showAnswer: !this.state.showAnswer})}
      >
      <span className='card__counter'>{this.props.cardNumber + 1}</span>
        <div 
          className='card__flip-card'
          onClick={ () => {
            this.setState({showAnswer: !this.state.showAnswer});
          }}
        >

          <span className={`fa fa-${iconClass}`}/>
        </div>
        <div className={`card__content--${contentClass}`}>
          {content}
        </div>
        <div className={`card__actions ${actionClass}`}>
          <div 
            className='card__prev-button'
            onClick={() => {
              this.props.showPrevCard();
              this.setState({showAnswer: false});
            }}
          >
            Prev
          </div>
          <div 
            className='card__next-button'
            onClick={() => {
              this.props.showNextCard();
              this.setState({showAnswer: false});
            }}
          >
            Next
          </div>
        </div>
      </div>
    );
  }
}

class CardContainer extends React.Component {
  constructor() {
    super();
    this.state = {
      cards: Immutable.fromJS([{
        word: 'Jazz',
        description: 'A type of music of black American origin characterized by improvisation, syncopation, and usually a regular or forceful rhythm, emerging at the beginning of the 20th century.',
      }, {
        word: 'Reggae',
        description: 'Music like Bob Marley, man.',
      }, {
        word: 'Folk',
        description: 'Music like Bob Dylan, man.',
      }
    ]),
      cardNumber: 0
    };
    this.boundCallback = this.hideCreateCard.bind(this);
    this.boundCreateCard = this.setCard.bind(this);
    this.boundShowPrevCard = this.showPrevCard.bind(this);
    this.boundShowNextCard = this.showNextCard.bind(this);
  }
  
  hideCreateCard() {
    this.setState({showModal: false});
  }
  
  showNextCard() {
    if ((this.state.cardNumber + 1) !== this.state.cards.size) {
      this.setState({cardNumber: this.state.cardNumber += 1});
    }
  }
  
  showPrevCard() {
    if (this.state.cardNumber !== 0) {
      this.setState({cardNumber: this.state.cardNumber -= 1});
    }
  }
  
  setCard(card) {
    const newCards = this.state.cards.push(card);
    this.setState({cards: newCards});
  }
  
  generateDots() {
    const times = this.state.cards.size;
    let arr = [];
    _.times(times).forEach((num) => {
      const dotClass = num  === this.state.cardNumber ? 'active' : '';
      arr.push(
        <span 
          className={`card-container__dot fa fa-circle ${dotClass}`}
          onClick={() => this.setState({cardNumber: num})}
        />
      )
    });
    return arr;
  }
  
  generateCards() {
    const cards = this.state.cards;
     const cardsList = cards.map((card) => {
        return (
          <Card 
            frontContent={card.get('word')}
            backContent={card.get('description')}
            showNextCard={this.boundShowNextCard}
            showPrevCard = {this.boundShowPrevCard}
            cardNumber={this.state.cardNumber}
          />
          );
      })
     return(cardsList.toJS()[this.state.cardNumber]); 
  }
  render() {
    return (
      <div>
        <span 
            className='card-container__icon  fa fa-plus' 
            onClick={() => {
              this.setState({showModal: !this.state.showModal});
            }}
          />
        {this.state.showModal 
          ? <CreateCard 
              onShadowClick={this.boundCallback}
              onCreateCard={this.boundCreateCard}
            /> 
          : ''}
        {this.generateCards()}
        <div className='card-container__dots-wrapper'>
          {this.generateDots()}
        </div>
      </div>
   );
  }
}

class Main extends React.Component {
  render() {
    return (
      <div className='wrapper'>
        <Header />
        <div className='content-wrapper'>
          <CardContainer />
        </div>
      </div>
    );
  }
}

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

Console