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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

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About the <head>

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Insecure Resource

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CSS

About CSS Preprocessors

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.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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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 

              
                #root
!

CSS 

              
                $display: #8E89B7;
$calculator: #392B58;
$border: #6C969D;
$numbers: #392B58;
$cuentas: #EDEBEF;
$body: #563891;
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: sans-serif;
}

body {
  background-color: $body;
}

.container {
  max-width: 300px;
  margin: 59px auto 0 auto;
  -webkit-box-shadow: 6px 4px 43px -4px rgba(0,0,0,1);
  -moz-box-shadow: 6px 4px 43px -4px rgba(0,0,0,1);
   box-shadow: 6px 4px 43px -4px rgba(0,0,0,.8);
  background-color: $body;
  border-radius: 20px;
}

h2 {
  text-align: right;
  font-size: 3rem;
  color: $numbers;
  text-shadow: 1px 1px 1px;
  font-weight: light;
} 

.display {
  width: 100%;
  height: 90px;
  padding: 10px;
  background-color: $display;
  -webkit-box-shadow: inset 6px 4px 58px -25px rgba(0,0,0,1);
  -moz-box-shadow: inset 6px 4px 58px -25px rgba(0,0,0,1);
  box-shadow: inset 6px 4px 58px -25px rgba(0,0,0,1);
  overflow:hidden;
  display: grid;
  align-content: center;
  border-top-left-radius: 10px;
  border-top-right-radius: 10px;
}

.buttons {
  width: 100%;
  margin: 0 auto;
}

.left, rigth {
  display: inline-block;
}
.left {
  width: 75%;
}
.rigth {
  width: 25%;
  float: right;
}
.buttons-key {
  background-color: $calculator;
  width: 100%;
}


.button {
  width: 75px;
  height: 75px;
  padding: 20px;
  cursor: pointer;
  display: inline-block;
  font-size: 1.5rem;
  -webkit-box-shadow: inset 6px 4px 58px -25px rgba(0,0,0,1);
  -moz-box-shadow: inset 6px 4px 58px -25px rgba(0,0,0,1);
  box-shadow: inset 6px 4px 58px -25px rgba(0,0,0,1);
  border-radius: 1px;
}

.btnrg {
  background-color: $numbers;
  border: 1px solid transparent;
  color: white;
  border-top: 1px solid transparent;
} 

.btnrg:hover {
  background-color: $border;
}

.slash, .multi, .minus, .plus, .ce {
  background-color: $cuentas;
  border: 1px solid transparent;
  width: 75px;
  height: 60px; 
  padding: 0;
  
}

.slash:hover, .multi:hover, .minus:hover, .plus:hover, .ce:hover {
  background-color: #A292C3;

}
!

JS 

              
                class Display extends React.Component {
  render() {
    return (<div className="display">
        <h2>
          {this.props.result}
        </h2>
    </div>)
  }
}

class ButtonsKey extends React.Component {
  render() {
    return (
      <div className="buttons-key">
        <div className="left">
        <button onClick={this.props.onClick} className="button btnrg seven" value="7">7</button>
        <button onClick={this.props.onClick} className="button btnrg eight" value="8">8</button>
        <button onClick={this.props.onClick} className="button btnrg nine" value="9">9</button>
        <button onClick={this.props.onClick} className="button btnrg four" value="4">4</button>
        <button onClick={this.props.onClick} className="button btnrg five" value="5">5</button>
        <button onClick={this.props.onClick} className="button btnrg six" value="6">6</button>
        <button onClick={this.props.onClick} className="button btnrg one" value="1">1</button>
        <button onClick={this.props.onClick} className="button btnrg two" value="2">2</button>
        <button onClick={this.props.onClick} className="button btnrg three" value="3">3</button>
        <button onClick={this.props.onClick} className="button btnrg zero" value="0">0</button>
        <button onClick={this.props.onClick} className="button btnrg point" value=".">.</button>
        <button onClick={this.props.onClick} className="button btnrg equal" value="=">=</button>
          </div>
        <div className="rigth">
          <button onClick={this.props.onClick} className="button ce" value="ce">CE</button>
          <button onClick={this.props.onClick} className="button slash" value="/">/</button>
          <button onClick={this.props.onClick} className="button multi" value="*">x</button>
          <button onClick={this.props.onClick} className="button minus" value="-">-</button>
          <button onClick={this.props.onClick} className="button plus" value="+">+</button>
        </div>
        </div>);
  }
}

class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      result: ''
    }
    
    this.handleClick = this.handleClick.bind(this);
    
  }
    
  handleClick(event) {
    const value = event.target.value;
    let result = this.state.result;
     if (value === 'ce') {
       let stop = result.slice(0, result.length -1);
        this.setState({result: stop});
      } else if (value === "=") {
          let re = eval(result);
          if (re.toString().length >= 15) {
              re = re.toString().substring(0, 9);
              this.setState({result: re});
          } else {
                this.setState({result: re.toString()});
            }
    } else {
      this.setState({result: result + value});
    }
  }
  
  render() {
    return (
    <div className="container">
        <Display result={this.state.result} />
        <div className="buttons">
            <ButtonsKey onClick={this.handleClick}/>
          </div>
        </div>);
  }
}

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

Console