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HTML

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

CSS

              
                @font-face
  font-family: "LCD"
  src: url("//db.onlinewebfonts.com/t/233131eb5b5e4a930cbdfb07008a09e1.eot")
  src: url("//db.onlinewebfonts.com/t/233131eb5b5e4a930cbdfb07008a09e1.eot?#iefix") format("embedded-opentype"), url("//db.onlinewebfonts.com/t/233131eb5b5e4a930cbdfb07008a09e1.woff2") format("woff2"), url("//db.onlinewebfonts.com/t/233131eb5b5e4a930cbdfb07008a09e1.woff") format("woff"), url("//db.onlinewebfonts.com/t/233131eb5b5e4a930cbdfb07008a09e1.ttf") format("truetype"), url("//db.onlinewebfonts.com/t/233131eb5b5e4a930cbdfb07008a09e1.svg#LCD") format("svg")

body
  background-color: #2E0A3C
  background-image: url("https://d2v9y0dukr6mq2.cloudfront.net/video/thumbnail/ro7gaTGVVjrn6n787/videoblocks-80s-retro-background-4k_bv-jnafone_thumbnail-full01.png")
  background-position: center center
  background-attachment: fixed
  background-size: cover
  background-repeat: no-repeat
  padding-top: 100px

.container
  width: 400px
  margin: 0 auto
  background: #E4D8B4
  border-radius: 8px
  border-bottom: 15px solid rgba(0,0,0,0.3)
  padding: 30px
  text-align: center
  box-shadow: inset 0 1px 5px 5px rgba(0,0,0,0.2)

#display
  display: block
  height: 100px
  border: 15px inset #aaa
  background: #333
  margin-bottom: 25px
  color: rgba(255,255,255,0.4)
  letter-spacing: 1px
  text-align: right
  padding: 0 30px
  line-height: 2
  font-size: 3em
  font-family: 'LCD'

button
  cursor: pointer
  background: linear-gradient(#83B799, #729e84)
  border-top-left-radius: 4px
  border-top-right-radius: 4px
  border-bottom-left-radius: 2px
  border-bottom-right-radius: 2px
  border-right: 1px solid #4d6b5a
  border-left: 1px solid #4d6b5a
  border-bottom: 9px solid #4d6b5a
  border-top: 1px solid #4d6b5a
  padding: 18px 30px
  color: #fff
  font-weight: bold
  position: relative
  box-shadow: 0 2px 1px 2px rgba(0,0,0,0.6), inset 0 0 3px 4px rgba(0,0,0,.075)
  font-size: 1.2em
  display: inline-block

button:active
  background: linear-gradient(#729e84, #83B799)
  border-top: 1px solid #4d6b5a
  border-bottom: 3px solid #4d6b5a
  margin-top: 3px
  box-shadow: 0 1px 1px 2px rgba(0,0,0,0.6), inset 0 0 3px 4px rgba(0,0,0,.05)

button.red:active
  background: linear-gradient(#B35550, #E86F68)
  border-top: 1px solid #B35550
  border-bottom: 3px solid #B35550

button.gray:active 
  background: linear-gradient(#7F7F7F, #999)
  border-top: 1px solid #777
  border-bottom: 3px solid #666

button:focus
  outline: none

.red
  background: linear-gradient(#994945, #E86F68)
  color: #fff
  border-color: #994945

.gray
  background: linear-gradient(#999, #7F7F7F)
  color: #333
  border-color: #666

#calculator
  margin: 0 auto
  display: grid
  grid-template-columns: repeat(4, 1fr)
  grid-template-rows: repeat(5, minmax(80px, auto))
  grid-gap: 12px 15px

  button:active
    height: calc(100% - 2px)

  .span-h
    grid-column: span 2
   
  .span-v
    grid-row: span 2
   
   
.control
  text-align: right

.brand
  font-family: "Impact", sans-serif
  float: left
  font-size: 1.8em
  line-height: 1
  text-shadow: -1px -1px 0px rgba(255, 255, 255, 0.3), 1px 1px 0px rgba(0, 0, 0, 0.8)
  color: #222
  opacity: 0.7

.switch
  position: relative
  display: inline-block
  width: 60px
  height: 34px
  margin-bottom: 20px

  input
    opacity: 0
    width: 0
    height: 0

.slider
  position: absolute
  cursor: pointer
  top: 0
  left: 0
  right: 0
  bottom: 0
  background-color: #ccc
  -webkit-transition: .4s
  transition: .4s
  &:before
    position: absolute
    content: ""
    height: 26px
    width: 26px
    left: 4px
    bottom: 4px
    background-color: white
    -webkit-transition: .4s
    transition: .4s

input
  &:checked + .slider
    background-color: #2196F3
  &:focus + .slider
    box-shadow: 0 0 1px #2196F3
  &:checked + .slider:before
    -webkit-transform: translateX(26px)
    -ms-transform: translateX(26px)
    transform: translateX(26px)
              
            
!

JS

              
                console.clear()

class Calculator extends React.Component {
   constructor(props) {
      super(props)
      this.state = {
         input: [],
         tempInput: [],
         output: ["0"],
         hasComma: false,
         operator: null,
         negativeOperator: false
      }
      this.getButtonValue = this.getButtonValue.bind(this)
      this.setOperator = this.setOperator.bind(this)
      this.equate = this.equate.bind(this)
   }

   equate() {
      const { input, output, operator, tempInput } = this.state

      this.setState({
         input: [eval(input.join("") + operator + tempInput.join("")).toString()],
         tempInput: [],
         operator: null,
         output: [eval(input.join("") + operator + tempInput.join("")).toString()]
      }, () => console.log("state", this.state))
   }
   
   // 3 + 5 * 6 - 2 / 4

   clear() {
      // Set state back to initial state
      this.setState({
         input: [],
         tempInput: [],
         output: ["0"],
         hasComma: false,
         operator: null,
         negativeOperator: false
      })
   }

   setOperator(event) {
      
      const { tempInput, input, output, operator, negativeOperator } = this.state
      
      if (!this.state.input.length && event.target.textContent == "-") {
         // If input is empty, and operator is "-"
         this.setState({
            input: [...input, event.target.textContent],
            output: [...input, event.target.textContent],
            negativeOperator: true
         }, () => console.log("state", this.state))
      } else if (event.target.textContent === "-" && !operator && !negativeOperator) {
         // If an operation is started, init a negative number
         this.setState({
            tempInput: [...tempInput, event.target.textContent],
            output: [...tempInput, event.target.textContent],
            negativeOperator: true
         }, () => console.log("state minush", this.state))
      } else if (event.target.textContent !== "-") {
         // If the operator is not minus, set the operator as usual
         this.setState({
            // set x value to *, else set the others as normal
            operator: event.target.textContent === "x" ? "*" : event.target.textContent
         }, () => console.log("state", this.state))
      } else if (negativeOperator && event.target.textContent === "-") {
         this.setState({
            operator: event.target.textContent
         }, () => console.log("state", this.state))
      } else if (!negativeOperator && operator !== '-' && event.target.textContent === "-") {
         this.setState({
            operator: event.target.textContent
         }, () => console.log("state", this.state))
      }
   }
   
   // Max number of rounded decimals = 8?
   // Max number of numbers when inputting  = 15

   getButtonValue(event) {

      const { input, output, tempInput, hasComma, operator } = this.state

       switch (event.target.textContent) {
          case ".":
             if (!this.state.input.length) {
                // If input is empty, add zero before comma 
                this.setState({
                   input: ["0", event.target.textContent],
                   output: ["0", event.target.textContent],
                   hasComma: true
                }, () => console.log("state", this.state))
             } else if (this.state.input[0] === "0" && !hasComma && !operator) {
                // If first number is zero, add comma
                this.setState({
                   input: [...input, event.target.textContent],
                   output: [...input, event.target.textContent],
                   hasComma: true
                }, () => console.log("state", this.state))
             } else if (!hasComma && !operator) {
                // If it's a whole number and doesn't have comma or operator, add comma
                this.setState({
                   input: [...input, event.target.textContent],
                   output: [...input, event.target.textContent],
                   hasComma: true
                }, () => console.log("state", this.state))       
             } else if (operator && !this.state.tempInput.length) {
                // If an operation is selected, add zero before comma
                this.setState({
                   tempInput: ["0", event.target.textContent],
                   output: ["0", event.target.textContent],
                   hasComma: true
                }, () => console.log("state", this.state))             
             } else if (operator && parseInt(this.state.tempInput[0]) > 0) {
                // If an operation is selected, add zero before comma
                this.setState({
                   tempInput: [...tempInput, event.target.textContent],
                   output: [...tempInput, event.target.textContent],
                   hasComma: true
                }, () => console.log("state", this.state))             
             } else if (this.state.tempInput[0] === "0" && operator) {
                // If an operation is selected, add zero before comma
                this.setState({
                   tempInput: ["0", event.target.textContent],
                   output: ["0", event.target.textContent],
                   hasComma: true
                }, () => console.log("state", this.state))        
             }
             break
          case "0":
             if (!this.state.input.length && !hasComma) {
                // If input is empty and there is no comma
                this.setState({
                   input: [...input, event.target.textContent],
                   output: [...input, event.target.textContent]
                }, () => console.log("state", this.state))
               
             } else if (this.state.input[0] == "0" && this.state.input[1] == ".") {
                // If input is "0.", continue adding numbers
                this.setState({
                   input: [...input, event.target.textContent],
                   output: [...input, event.target.textContent]
                }, () => console.log("state", this.state))
                
             } else if (this.state.input.length && hasComma && !operator) {
                // if there is some input and it's a decimal number
                this.setState({
                   input: [...input, event.target.textContent],
                   output: [...input, event.target.textContent]
                }, () => console.log("state", this.state))
             } else if (this.state.input.length && hasComma && operator) {
                // if there is some input and it's a decimal number and a selected operator
                this.setState({
                   tempInput: [...tempInput, event.target.textContent],
                   output: [...tempInput, event.target.textContent],
                }, () => console.log("state", this.state))
             } else if (parseInt(this.state.input[0]) > 0 && !hasComma) {
                // if the input is a number, value is greater than 0, and is a whole number
                this.setState({
                   input: [...input, event.target.textContent],
                   output: [...input, event.target.textContent]
                }, () => console.log("state", this.state)) 
             }
             break
          case "1":
          case "2":
          case "3":
          case "4":
          case "5":
          case "6":
          case "7":
          case "8":
          case "9":
             if (this.state.input[0] == "0" && !hasComma) {
                this.setState({
                   input: [event.target.textContent],
                   output: [event.target.textContent]
                }, () => console.log("state", this.state))
             } else if (operator) {
                this.setState({
                   tempInput: [...tempInput, event.target.textContent],
                   output: [...tempInput, event.target.textContent]
                }, () => console.log("state", this.state))
             } else {
                this.setState({
                   input: [...input, event.target.textContent],
                   output: [...input, event.target.textContent]
                }, () => console.log("statez", this.state))      
             }
             break
          default:
             this.setState({
                output: "ERROR"
             })
             break
       }
   }
   
   render() {
      const { output } = this.state
      return (
         <div className='container'>
            <div id="display">
               { output }
            </div>
            <div className="control">
               <div className="brand">
                  калькулятор
               </div>
               <label className="switch">
                 <input type="checkbox" />
                 <span className="slider"></span>
               </label>
            </div>
            <div id="calculator">
               <button id="clear" className="span-h red" onClick={() => this.clear()}>AC</button>
               <button id="divide" onClick={this.setOperator} className="gray">/</button>
               <button id="multiply" onClick={this.setOperator} className="gray">x</button>
               <button id="seven" onClick={this.getButtonValue}>7</button>
               <button id="eight" onClick={this.getButtonValue}>8</button>
               <button id="nine" onClick={this.getButtonValue}>9</button>
               <button id="subtract" onClick={this.setOperator} className="gray">-</button>
               <button id="four" onClick={this.getButtonValue}>4</button>
               <button id="five" onClick={this.getButtonValue}>5</button>
               <button id="six" onClick={this.getButtonValue}>6</button>
               <button id="add" onClick={this.setOperator} className="gray">+</button>
               <button id="one" onClick={this.getButtonValue}>1</button>
               <button id="two" onClick={this.getButtonValue}>2</button>
               <button id="three" onClick={this.getButtonValue}>3</button>
               <button id="equals" onClick={this.equate} className="span-v gray">=</button>
               <button id="zero" onClick={this.getButtonValue} className="span-h">0</button>
               <button id="decimal" onClick={this.getButtonValue} className="gray">.</button>
            </div>
         </div>

      )
   }
}

ReactDOM.render(
   <Calculator />,
   document.getElementById('app')
)

/*
   EXAMPLE: 3 + 5 x 6 - 2 / 4 =
   Immediate Execution Logic: 11.5
   Formula/Expression Logic: 32.5
*/
VanillaTilt.init(document.querySelector(".container"), {
   glare: true,
   "max-glare": 0.2
});

/*

3.23 + 33.2

input = ["3", "3"]


this.state = {
   initialInput: [],
   tempInput: [],
   output: ["0"]
}

this.state = {
   initialInput: ["2", ".", "3"],
   tempInput: [],
   output: initalInput, ...
}

ouput = ["3", "3"]

pressing = should update both initial and ouput to the same
clear temp input

*/
 
 
 
/*

class Calculator extends React.Component {
   constructor(props) {
      super(props)
      this.state = {
         input: [],
         tempInput: [],
         output: ["0"],
         hasComma: false,
         operator: null
      }
      this.getButtonValue = this.getButtonValue.bind(this)
      this.setOperator = this.setOperator.bind(this)
      this.equate = this.equate.bind(this)
   }

   equate() {
      const { input, output, operator, tempInput } = this.state

      this.setState({
         input: [eval(input.join("") + operator + tempInput.join("")).toString()],
         tempInput: [],
         operator: null,
         output: [eval(input.join("") + operator + tempInput.join("")).toString()]
      }, () => console.log("state", this.state))
   }
   
   // 3 + 5 * 6 - 2 / 4
   
   clear() {
      // Set state back to initial state
      this.setState({
         input: [],
         tempInput: [],
         output: ["0"],
         hasComma: false,
         operator: null
      })
   }

   setOperator(event) {
      
      const { operator } = this.state
      
      if ( operator ) {
         // If there is an operator, run equation
         this.equate()
      }
      this.setState({
         // set x value to *, else set the others as normal
         operator: event.target.textContent === "x" ? "*" : event.target.textContent
      }, () =>  console.log("state", this.state))
   }
   
   // Max number of rounded decimals = 8?
   // Max number of numbers when inputting  = 15

   getButtonValue(event) {

      const { input, output, tempInput, hasComma, operator } = this.state

       switch (event.target.textContent) {
          case ".":
             if (!this.state.input.length) {
                // If input is empty, add zero before comma 
                this.setState({
                   input: ["0", event.target.textContent],
                   output: ["0", event.target.textContent],
                   hasComma: true
                }, () => console.log("state", this.state))
             } else if (this.state.input[0] === "0" && !hasComma && !operator) {
                // If first number is zero, add comma
                this.setState({
                   input: [...input, event.target.textContent],
                   output: [...input, event.target.textContent],
                   hasComma: true
                }, () => console.log("state", this.state))
             } else if (!hasComma && !operator) {
                // If it's a whole number and doesn't have comma or operator, add comma
                this.setState({
                   input: [...input, event.target.textContent],
                   output: [...input, event.target.textContent],
                   hasComma: true
                }, () => console.log("state", this.state))       
             } else if (operator && !this.state.tempInput.length) {
                // If an operation is selected, add zero before comma
                this.setState({
                   tempInput: ["0", event.target.textContent],
                   output: ["0", event.target.textContent],
                   hasComma: true
                }, () => console.log("state", this.state))             
             } else if (operator && parseInt(this.state.tempInput[0]) > 0) {
                // If an operation is selected, add zero before comma
                this.setState({
                   tempInput: [...tempInput, event.target.textContent],
                   output: [...tempInput, event.target.textContent],
                   hasComma: true
                }, () => console.log("state", this.state))             
             }
             break
          case "0":
             if (!this.state.input.length && !hasComma) {
                // If input is empty and there is no comma
                this.setState({
                   input: [...input, event.target.textContent],
                   output: [...input, event.target.textContent]
                }, () => console.log("state", this.state))
               
             } else if (this.state.input[0] == "0" && this.state.input[1] == ".") {
                // If input is "0.", continue adding numbers
                this.setState({
                   input: [...input, event.target.textContent],
                   output: [...input, event.target.textContent]
                }, () => console.log("state", this.state))
                
             } else if (this.state.input.length && hasComma && !operator) {
                // if there is some input and it's a decimal number
                this.setState({
                   input: [...input, event.target.textContent],
                   output: [...input, event.target.textContent]
                }, () => console.log("state", this.state))
             } else if (this.state.input.length && hasComma && operator) {
                // if there is some input and it's a decimal number and a selected operator
                this.setState({
                   tempInput: [...tempInput, event.target.textContent],
                   output: [...tempInput, event.target.textContent],
                }, () => console.log("state", this.state))
             } else if (parseInt(this.state.input[0]) > 0 && !hasComma) {
                // if the input is a number, value is greater than 0, and is a whole number
                this.setState({
                   input: [...input, event.target.textContent],
                   output: [...input, event.target.textContent]
                }, () => console.log("state", this.state)) 
             }
             break
          case "1":
          case "2":
          case "3":
          case "4":
          case "5":
          case "6":
          case "7":
          case "8":
          case "9":
             if (this.state.input[0] == "0" && !hasComma) {
                this.setState({
                   input: [event.target.textContent],
                   output: [event.target.textContent]
                }, () => console.log("state", this.state))
             } else if (operator) {
                this.setState({
                   tempInput: [...tempInput, event.target.textContent],
                   output: [...tempInput, event.target.textContent]
                }, () => console.log("state", this.state))
             } else {
                this.setState({
                   input: [...input, event.target.textContent],
                   output: [...input, event.target.textContent]
                }, () => console.log("statez", this.state))      
             }
             break
          default:
             this.setState({
                output: "ERROR"
             })
             break
       }
   }
   
   render() {
      const { output } = this.state
      return (
         <div className='container'>
            <div id="display">
               { output }
            </div>

            <div id="calculator" >
               <button id="clear" className="span-h red" onClick={() => this.clear()}>AC</button>
               <button id="divide" onClick={this.setOperator} className="gray">/</button>
               <button id="multiply" onClick={this.setOperator} className="gray">x</button>
               <button id="seven" onClick={this.getButtonValue}>7</button>
               <button id="eight" onClick={this.getButtonValue}>8</button>
               <button id="nine" onClick={this.getButtonValue}>9</button>
               <button id="subtract" onClick={this.setOperator} className="gray">-</button>
               <button id="four" onClick={this.getButtonValue}>4</button>
               <button id="five" onClick={this.getButtonValue}>5</button>
               <button id="six" onClick={this.getButtonValue}>6</button>
               <button id="add" onClick={this.setOperator} className="gray">+</button>
               <button id="one" onClick={this.getButtonValue}>1</button>
               <button id="two" onClick={this.getButtonValue}>2</button>
               <button id="three" onClick={this.getButtonValue}>3</button>
               <button id="equals" onClick={this.equate} className="span-v gray">=</button>
               <button id="zero" onClick={this.getButtonValue} className="span-h">0</button>
               <button id="decimal" onClick={this.getButtonValue} className="gray">.</button>
            </div>
         </div>

      )
   }
}

ReactDOM.render(
   <Calculator />,
   document.getElementById('app')
)
*/

              
            
!
999px

Console