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About the <head>

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

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About Vendor Prefixing

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

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

CSS 

              
                body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  background-color: #fff;
}

.App {
    margin-top: 55px;
    text-align: center;
}

.App .source-link {
    font-size: 12px;
    display: inline-block;
    margin: 40px;
    color: #666;
    text-decoration: none;
    font-weight: 100;
}

.App .source-link:hover {
    text-decoration: underline;
}

h1 {
    text-transform: uppercase;
    font-weight: 100;
    color: #666;
    opacity: 0;
 }

h1.animate {
     opacity: 1;
     transition: all 3s;
 }

.tubes-wrapper {
    margin-top: 80px;
    text-align: center;
    width: 100%;
}

.tubes-wrapper .tube-wrapper {
    display: inline-block;
    margin-bottom: 70px;
}

.tubes-wrapper .tube-wrapper .level-name {
    display: block;
    text-align: center;
    text-transform: uppercase;
    margin-top: 30px;
    color: #666;
    font-weight: 100;
}

.tubes-wrapper .tube {
    display: inline-block;
    height: 290px;
    width: 70px;
    margin: 0 50px;
    border: 2px solid #333;
    border-bottom-left-radius: 15px;
    border-bottom-right-radius: 15px;
    border-top: 0;
    position: relative;
}

.tubes-wrapper .tube .liquid {
    position: absolute;
    bottom: 0;
    top: 0;
    left: 0;
    right: 0;
    transition: all 1s;
    background-color: #eee;
    border-bottom-left-radius: 13px;
    border-bottom-right-radius: 13px;
    z-index: -1;
}

.tubes-wrapper .tube .metrics {
    position: absolute;
    bottom: 0;
    top: 0;
    left: 0;
    right: 0;
    height: 280px;
    width: 25px;
}

.tubes-wrapper .tube .side-line {
    position: absolute;
    bottom: 40px;
    right: 7px;
    height: 85px;
    border-left: 2px solid #333;
}

.tubes-wrapper .tube .neck {
    position: absolute;
    top: -20px;
    right: -2px;
    left: -2px;
    height: 20px;
    border-left: 2px solid #333;
    border-right: 2px solid #333;
}

.tubes-wrapper .tube .head {
    position: absolute;
    top: -27px;
    right: -6px;
    left: -6px;
    height: 5px;
    border-radius: 6px;
    border: 2px solid #333;

}

.tubes-wrapper .tube .metrics .line {
    width: 50%;
    border-top: 2px solid #333;
    display: block;
    margin-bottom: 2px;
    margin-top: 2px;
}

.tubes-wrapper .tube .metrics .line:first-child {
    margin-top: 0;
}

.tubes-wrapper .tube .metrics .line:nth-child(5n) {
    width: 100%;
}

.tubes-wrapper .tube .liquid .circle,
.tubes-wrapper .tube .liquid .circle2,
.tubes-wrapper .tube .liquid .circle3,
.tubes-wrapper .tube .liquid .circle4,
.tubes-wrapper .tube .liquid .circle5,
.tubes-wrapper .tube .liquid .circle6
 {
     z-index: -1;
     opacity: 0;
     height: 20px;
     width: 20px;
     border-radius: 50%;
     background-color: #5DF810;
     display: block;
     left: 0px;
     top: 0;
     position: absolute;
 }

.tubes-wrapper .tube .liquid .circle7,
.tubes-wrapper .tube .liquid .circle8,
.tubes-wrapper .tube .liquid .circle9
{
    z-index: -2;
    opacity: 0;
    height: 20px;
    width: 20px;
    border-radius: 50%;
    background-color: #fff !important;
    display: block;
    left: 0px;
    bottom: 0;
    position: absolute;
}

.tubes-wrapper .tube .liquid.animate .circle {
    animation: lol 2s;
    animation-delay: 1s;
}

.tubes-wrapper .tube .liquid.animate .circle2 {
    animation: lol2 2s;
    animation-delay: 1s;
}

.tubes-wrapper .tube .liquid.animate .circle3 {
    animation: lol3 2s;
    animation-delay: 1s;
}

.tubes-wrapper .tube .liquid.animate .circle4 {
    animation: lol4 2s;
    animation-delay: 1s;
}

.tubes-wrapper .tube .liquid.animate .circle5 {
    animation: lol5 2s;
    animation-delay: 1s;
}

.tubes-wrapper .tube .liquid.animate .circle6 {
    animation: lol6 2s;
    animation-delay: 1s;
}

.tubes-wrapper .tube .liquid.animate .circle7 {
    animation: lol7 1.5s;
    animation-delay: .4s;
}

.tubes-wrapper .tube .liquid.animate .circle8 {
    animation: lol8 1.5s;
    animation-delay: .4s;
}

.tubes-wrapper .tube .liquid.animate .circle9 {
    animation: lol9 1.5s;
    animation-delay: .4s;
}

.tubes-wrapper .tube .liquid.dopamine {
    background-color: #2BA5EF;

}

.tubes-wrapper .tube .liquid.serotonin {
    background-color: #5DF810;
}

.tubes-wrapper .tube .liquid.oxytocin {
    background-color: #D303BB;
}

.tubes-wrapper .tube .liquid .bubble {
    background-color: #eee;

}

.tubes-wrapper .tube .liquid.dopamine .bubble {
    background-color: #2BA5EF;

}

.tubes-wrapper .tube .liquid.serotonin .bubble {
    background-color: #5DF810;
}

.tubes-wrapper .tube .liquid.oxytocin .bubble {
    background-color: #D303BB;
}

@keyframes lol {
    0% {
        opacity: 1;
        left: 50%;
        height: 0px;
        width: 0px;
    }

    50% {

        opacity: 1;
        left: 20%;
        height: 15px;
        width: 15px;
    }

    100% {
        opacity: 1;
        top: -80px;
        left: 55%;
        height: 0px;
        width: 0px;
    }
}

@keyframes lol2 {
    0% {
        opacity: 1;
        left: 50%;
        height: 0px;
        width: 0px;
    }

    50% {

        opacity: 1;
        left: 60%;
        height: 10px;
        width: 10px;
    }

    100% {
        opacity: 1;
        top: -100px;
        left: 35%;
        height: 0px;
        width: 0px;
    }
}

@keyframes lol3 {
    0% {
        opacity: 1;
        left: 50%;
        height: 0px;
        width: 0px;
    }

    50% {

        opacity: 1;
        left: 60%;
        height: 10px;
        width: 10px;
    }

    100% {
        opacity: 1;
        top: -40px;
        left: 35%;
        height: 0px;
        width: 0px;
    }
}

@keyframes lol4 {
    0% {
        opacity: 1;
        left: 65%;
        height: 0px;
        width: 0px;
    }

    50% {

        opacity: 1;
        left: 55%;
        height: 10px;
        width: 10px;
    }

    100% {
        opacity: 1;
        top: -60px;
        left: 70%;
        height: 0px;
        width: 0px;
    }
}

@keyframes lol5 {
    0% {
        opacity: 1;
        left: 25%;
        height: 0px;
        width: 0px;
    }

    50% {

        opacity: 1;
        left: 35%;
        height: 5px;
        width: 5px;
    }

    100% {
        opacity: 1;
        top: -20px;
        left: 40%;
        height: 0px;
        width: 0px;
    }
}

@keyframes lol6 {
     0% {
         opacity: 1;
         left: 50%;
         height: 0px;
         width: 0px;
     }

     50% {

         opacity: 1;
         left: 50%;
         height: 5px;
         width: 5px;
     }

     100% {
         opacity: 1;
         top: -35px;
         left: 55%;
         height: 0px;
         width: 0px;
     }
 }

@keyframes lol7 {
    0% {
        opacity: 1;
        left: 50%;
        height: 0px;
        width: 0px;
    }

    50% {

        opacity: 1;
        left: 50%;
        height: 5px;
        width: 5px;
    }

    100% {
        opacity: 1;
        bottom: 80px;
        left: 55%;
        height: 0px;
        width: 0px;
    }
}

@keyframes lol8 {
    0% {
        opacity: 1;
        left: 50%;
        height: 0px;
        width: 0px;
    }

    50% {

        opacity: 1;
        left: 60%;
        height: 10px;
        width: 10px;
    }

    100% {
        opacity: 1;
        bottom: 30px;
        left: 35%;
        height: 0px;
        width: 0px;
    }
}

@keyframes lol9 {
    0% {
        opacity: 1;
        left: 50%;
        height: 0px;
        width: 0px;
    }

    50% {

        opacity: 1;
        left: 20%;
        height: 10px;
        width: 10px;
    }

    100% {
        opacity: 1;
        bottom: 50px;
        left: 55%;
        height: 0px;
        width: 0px;
    }
}
!

JS 

              
                const {Component} = React;
const {render} = ReactDOM;

class Level extends Component {
  render() {
    const {
      levelName,
      animate,
      percentage
    } = this.props;
    return (
      <div className="tube-wrapper">
                    <div className="tube">
                        <div className={"liquid " + levelName + ' ' + animate} style={{top: (100 - percentage) + '%'}}>
                            <div className="bubble circle"></div>
                            <div className="bubble circle2"></div>
                            <div className="bubble circle3"></div>
                            <div className="bubble circle4"></div>
                            <div className="bubble circle5"></div>
                            <div className="bubble circle6"></div>
                          <div className="bubble circle7"></div>
                        <div className="bubble circle8"></div>
                        <div className="bubble circle9"></div>
                        </div>
                        <div className="metrics">
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                            <div className="line"></div>
                        </div>
                        <div className="side-line"></div>
                        <div className="neck"></div>
                        <div className="head"></div>
                    </div>
                <span className="level-name">{this.props.levelName}</span>
            </div>
    )
  }
};

class App extends Component {
  state = {
    feelingIndex: 0,
    animate: '',
    current: 0
  };

  getFeelings = () => [{
    feeling: 'love',
    levels: {
      dopamine: 93,
      serotonin: 93,
      oxytocin: 93
    }
  }, {
    feeling: 'depression',
    levels: {
      dopamine: 28,
      serotonin: 14,
      oxytocin: 3
    }
  }, {
    feeling: 'happiness',
    levels: {
      dopamine: 3,
      serotonin: 100,
      oxytocin: 7
    }
  }, {
    feeling: 'anxiety',
    levels: {
      dopamine: 20,
      serotonin: 3,
      oxytocin: 3
    }
  }];

  changeFeeling = () => {
    let start = Date.now();
    this.setState({
      feelingIndex: this.state.current,
      animate: 'animate'
    });
    this.setState({
      current: this.state.current + 1
    });
    if (this.state.current === this.getFeelings().length) {
      this.setState({
        current: 0
      });
    }
    setTimeout(() => {
      let end = Date.now() - start;
      if (end > 3950) {
        this.setState({
          animate: ''
        });
      }
    }, 4000)
  };

  setInterval = () => {
    this.changeFeeling();
    setInterval(this.changeFeeling, 4500);
  };

  componentDidMount() {
    this.setInterval();
  };

  render() {
    const {
      feelingIndex,
      animate
    } = this.state;
    const feeling = this.getFeelings()[feelingIndex];
    const feelingName = feeling.feeling;
    const levels = feeling.levels;
    return (
      <div className="App">
                <h1 className={animate}>{feelingName}</h1>
                <div className="tubes-wrapper">
                    { Object.keys(levels).map((level, index) => <Level key={index} animate={animate} levelName={level} percentage={levels[level]}></Level>) }
                </div>
                            <a className="source-link" target="_blank" href="https://github.com/edindelan/animated-feelings">Source code - GitHub</a>
            </div>
    );
  }
}

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

Console