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HTML

              
                
              
            
!

CSS

              
                @mixin select($opt)
  -webkit-touch-callout: #{$opt}
  -webkit-user-select: #{$opt}
  -khtml-user-select: #{$opt}
  -moz-user-select: #{$opt}
  -ms-user-select: #{$opt}
  user-select: #{$opt}

*
  // border: solid 0.5px
  position: relative
  box-sizing: border-box
  font-family: Dosis
  +select(none)
  text-align: center
  font-weight: 600
  font-size: 1.02em

body,html
  height: 100vh
  margin: 0
  overflow: hidden

.app
  width: 38%
  position: absolute
  left: 50%
  top: 50%
  transform: translate(-50%,-50%)
  background-color: rgba(255,255,255,0.1)
  box-shadow: 0 0 10px 5px rgba(0,0,0,0.15)
  & .input
    & .prev
      margin: 0
      padding-right: 1em
      height: 3em
      line-height: 3em
      text-align: right
    & .calc
      width: 80%
      height: 1.5em
      line-height: 1.5em
      padding: 0.5em
      padding-top: 0
      margin: 0 auto
      font-size: 3em
      overflow: hidden
      border-bottom: dashed 2px
      font-weight: 500
      font-family: Concert One
      +select(auto)
      
  & .evals
    display: flex
    width: 100%
    & .key
      width: 33.3%
  & .box
    width: 100%
    display: flex
    flex-wrap: wrap
    & .nums
      width: 80%
      display: flex
      flex-wrap: wrap
    & .key
      width: 33.3%
    & .operators
      width: 20%
      display: flex
      flex-direction: column
      & .key
        width: 100%
  & .color
    width: 100%
    padding: 0.5em
    & .bgc
      border: solid 1px
      display: inline-block
      width: 43%
      padding: 0.2em
      +select(auto)
    & .copy
      padding: 0.2em
      border: solid 1px
      display: inline-block
      width: 25%
      cursor: pointer
      background-color: #fff
    & .toggle
      display: inline-block
      width: 18%
      text-align: left
      cursor: pointer
      // border-left: solid
      padding: 0.2em
      & span
        

.key
  height: 4em
  cursor: pointer
  line-height: 4.5em
  &:hover
    color: SkyBlue
  
@media screen and (max-width:480px)
  body,html
    height: 91vh
  .app
    width: 90%
  .key
    height: 3.5em
    line-height: 3.5em
  .color
    margin: 0.5em
  .app .input .calc
    height: 1.7em
    line-height: 1.7em
              
            
!

JS

              
                //components
const Input = React.createClass({
  render: function(){
    return (
    <div className="input">
    <p className="prev">{this.props.prevString}</p>
    <p className="calc">{this.props.calcString}</p>
      </div>
    );
  }
});

const Key = React.createClass({
  render: function(){
    return <div className="key" onClick={this.props.onClick}>{this.props.content}</div>;
  }
});

const Nums = React.createClass({
  render: function(){
    return (
    <div className ="nums">
    <Key content = "1" onClick = {this.props.Input}/>
    <Key content = "2" onClick = {this.props.Input}/>
    <Key content = "3" onClick = {this.props.Input}/>
    <Key content = "4" onClick = {this.props.Input}/>
    <Key content = "5" onClick ={this.props.Input}/>
    <Key content = "6" onClick = {this.props.Input}/>
    <Key content = "7" onClick = {this.props.Input}/>
    <Key content = "8" onClick = {this.props.Input}/>
    <Key content = "9" onClick ={this.props.Input}/>
    <Key content = "0" onClick = {this.props.Input}/>
    <Key content = "." onClick = {this.props.Input}/>
    <Key content = "00" onClick = {this.props.Input}/>     
    </div>
    );
  }
});

const Operators = React.createClass({
  render: function(){
    return (
    <div className = "operators">
    <Key content = "+" onClick = {this.props.Input}/>
    <Key content = "-" onClick = {this.props.Input}/>
    <Key content = "*" onClick = {this.props.Input}/>
    <Key content = "/" onClick = {this.props.Input}/>
    </div>
    );
  }
});

const Evals = React.createClass({
  render: function(){
    return (
    <div className = "evals">
      <Key content = "C" onClick = {this.props.clear}/>
      <Key content = "DEL" onClick = {this.props.del}/>
      <Key content = "=" onClick = {this.props.calc}/>
    </div>
    );
  }
});

const Toggle = React.createClass({
  render: function(){
    return (<span className = "toggle" onClick = {this.props.onClick}>{this.props.colorType}</span>);
  }
});

const Color = React.createClass({
  render: function(){
    return (
      <p className = "color">
      <Toggle colorType = {this.props.colorType} onClick = {this.props.toggle}/>
      <span className = "bgc">{this.props.color}</span>
    <span className = "copy" style={{color:this.props.color, backgroundColor: this.props.textColor, borderColor: this.props.textColor}} onClick={this.props.copy}>COPY</span>
    </p>
    );
  }
});

const Keyboard = React.createClass({
    render: function(){
  return (
        <div className = "keyborad">
    <Evals clear={this.props.clear} del={this.props.del} calc = {this.props.calc}/>  
    <div className = "box">
    <Nums Input = {this.props.Input}/>
    <Operators Input = {this.props.Input}/>
    <Color colorType = {this.props.colorType} color = {this.props.color} textColor = {this.props.textColor} copy = {this.props.copy} toggle = {this.props.toggle}/>
      </div>
      </div>
    );
  }
});

// putting together
const App = React.createClass({
  getInitialState: function(){
    return {
      prevString: "",
      calcString: "",
      color:"#2abacd",
      textColor:"#fff",
      colorType: "HEX ▸"
    };
  },
// Methods
  Input: function(e){
    let string = this.state.calcString + e.target.innerHTML;
    this.setState({calcString : string});
    this.shine();
  },
  clear: function(){        
    this.setState({
      calcString:"",
      prevString:""});
  }
  ,
  del: function(){
    let string = this.state.calcString.slice(0,-1);
    this.setState({calcString:string});
  },
  calc: function(){
	let result = eval(this.state.calcString),         
      prev = this.state.calcString;
	this.setState({calcString: result, prevString: prev});
  },
  hexToRgb: function(hex) {
    let result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
    return result ? {
        r: parseInt(result[1], 16),
        g: parseInt(result[2], 16),
        b: parseInt(result[3], 16)
    } : null;
}
  ,
rgbToHex: function(color) {
if (color.charAt(0) === "#") {
return color; }

let nums = /(.*?)rgb\((\d+),\s*(\d+),\s*(\d+)\)/i.exec(color),
    r = parseInt(nums[2], 10).toString(16), 
    g = parseInt(nums[3], 10).toString(16), 
    b = parseInt(nums[4], 10).toString(16);

return "#"+ ( (r.length == 1 ? "0"+ r : r) + (g.length == 1 ? "0"+ g : g) + (b.length == 1 ? "0"+ b : b) ); 

},
  
  shine: function(){
    let body = document.querySelector('body'),
        color = '#'+(0x1000000+(Math.random())*0xffffff).toString(16).substr(1,6),
        rgb = this.hexToRgb(color),      rgbColor = `rgb(${rgb.r},${rgb.g},${rgb.b})`,
        colorType=this.state.colorType;

   let o = Math.round(((rgb.r * 299) + (rgb.g * 587) + (rgb.b * 114)) / 1000);

(o > 180) ? this.state.textColor="#594741": this.state.textColor="#fff";

    colorType == "HEX ▸" ?
    this.setState({color: color}):this.setState({color: rgbColor})
  },
  copy: function(){
  let copyArea = document.querySelector('.bgc'),
      range = document.createRange(); 
      range.selectNode(copyArea); 
      window.getSelection().addRange(range);
      document.execCommand("Copy"); 
  },
  toggle: function(){
    let color = this.state.color,
        colorType = this.state.colorType;
    
    if(colorType == "HEX ▸"){
      let rgb = this.hexToRgb(color), 
          rgbColor = `rgb(${rgb.r},${rgb.g},${rgb.b})`;
      
      this.setState({colorType:"◂  RGB",color:rgbColor});
    }else{
      let hexColor = this.rgbToHex(color);
      this.setState({colorType:"HEX ▸",color:hexColor});
    }
  },

// Render app
  render: function(){
  document.querySelector('body').style.backgroundColor=this.state.color;  document.querySelector('body').style.color=this.state.textColor;
    
    return (
    <div className="app">
    
    <Input prevString={this.state.prevString} calcString={this.state.calcString}/>
    
    <Keyboard Input = {this.Input} colorType = {this.state.colorType} color = {this.state.color} textColor = {this.state.textColor} copy = {this.copy} toggle = {this.toggle} calc={this.calc} del={this.del} clear = {this.clear}/>
        
    </div>
    );
  }
});

ReactDOM.render(<App/>,document.querySelector('body'));

//learning redux to improve code
              
            
!
999px

Console