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HTML

              
                <html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Calculator</title>
    <link href="style.css" rel="stylesheet">
</head>
<body>
    <h4>Neumorphic Calculator.</h4>
	 <div class="layout"> 
    <div class="calculator">
        <div class="output">
            <div data-previous class="previous"></div>
            <div data-current class="current"></div>
        </div>
        <button data-clear class="span-two">Clear</button>
        <button data-delete>Del</button>
        <button data-operation>÷</button>
        <button data-number>1</button>
        <button data-number>2</button>
        <button data-number>3</button>
        <button data-operation>*</button>
        <button data-number>4</button>
        <button data-number>5</button>
        <button data-number>6</button>
        <button data-operation>+</button>
        <button data-number>7</button>
        <button data-number>8</button>
        <button data-number>9</button>
        <button data-operation>-</button>
        <button data-number>.</button>
        <button data-number>0</button>
        <button data-equals class="span-two">=</button>
    </div>
	</div>
	<footer>Created by 
		<a href="https://twitter.com/LilyKhan786" target="_blank">Lily</a> and
		<a href="https://repl.it/@ApoorvSingal" target="_blank">Kakashi.</a> 
	</footer>
</body>
</html>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css2?family=Parisienne&display=swap');

*, *::before, *::after{
    box-sizing: border-box;
    font-family: sans-serif;
    font-weight: normal;
    font-size: 10px;
}

body{
    padding:0;
    margin: 0;
    background: rgba(255, 192, 203, 0.7);
}

h4{
    color: #fff;
    font-size: 50px;
    text-align: center;
    font-family: 'Parisienne', cursive;
    font-weight: bold;
    text-shadow: -2px -2px 10px #fc737c;
}

.layout{
	margin: auto;
	width: 350px;
	height: 540px;
	position: relative;
	background: pink;
	border-radius: 20px;
   justify-content: center;
	box-shadow: 2px 2px 15px rgb(248, 147, 165);
}

.calculator{
    height: 500px;
    display: grid;
    justify-content: center;
    grid-template-columns: repeat(4, 70px);
    grid-template-rows: minmax(100px, auto) repeat(5, 70px);
}

.calculator > button{
    margin: 6px;
    color: #fff;
    font-size: 2rem;
    outline: none;
    cursor: pointer;
}

.span-two{
    grid-column: span 2;
    height: 90%;
    width: 95%;
    border-radius: 5em;
}

button{
    border-radius: 50%;
    border: none;
	 background: linear-gradient(315deg, #fc737c, pink);
	 box-shadow: 2px 2px 6px #f58787;
}

button:active{
	background: linear-gradient(315deg, pink, #fc737c);
}

.output{
    grid-column: 1/ -1;
    box-shadow : inset -2px -2px 10px #f17171;
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
	 flex-direction:column;
	 padding: 0px 20px;
	 word-wrap: break-word;
	 word-break: break-all;
    border-radius: 30px;
    margin: 35px 0 30px 0;
}
.output .previous {
	color: rgb(255, 255, 255, .7);
	font-size: 20px;
   margin-top:10px;
}

.output .current {
	color: #fff;
	font-size: 25px;
   margin: 5px 0;
}


footer{
	position: relative;
	margin: 20px 0;
	top: 10vh;
	height: 50px;
	width: 100%;
	text-align: center;
	color: #fff;
   font-size: 32px;
	font-weight: bold;
	text-shadow: 2px 2px 5px #fc737c;
	font-family: 'Parisienne', cursive;
}
a{
	color: #fff;
   font-size: 35px;
	font-weight: bold;
	text-decoration:none;
   font-family: 'Parisienne', cursive;
	text-shadow: 2px 2px 5px #fc737c;
}

              
            
!

JS

              
                //javescript was seen from youtube video (https://youtu.be/j59qQ7YWLxw) and other errors was fixed by Kakashi :) 

class Calculator{
	constructor(previousTextElement, currentTextElement) {
		this.previousTextElement = previousTextElement
		this.currentTextElement = currentTextElement
		this.clear()
	}
	
	clear(){
			this.current = ''
			this.previous = ''
			this.operation = undefined
	}
	
	delete(){
			this.current = this.current.toString().slice(0, -1)
	}
	
	appendNumber(number) {  
	    if (number === '.' && this.current.includes('.')) return;
        this.current = this.current.toString() + number.toString()
  }
	
 chooseOperation(operation) {
    if (this.current === '') return
    if (this.previous !== '') {
      this.compute()
    }

    this.operation = operation
    this.previous = this.current
    this.current = ''
  }
	
compute() {
    let computation
    const prev = parseFloat(this.previous)
    const current = parseFloat(this.current)
    if (isNaN(prev) || isNaN(current)) return
    
    switch (this.operation) {
      case '+':
        computation = prev + current
        break
      case '-':
        computation = prev - current
        break
      case '*':
        computation = prev * current
        break
      case '÷':
        computation = prev / current
        break
      default:
        return
    }
    this.current = computation.toString()
    this.operation = undefined
    this.previous = ''
  }
	
getDisplayNumber(number) {
	
	let str = ''
	const arr = number.split('.')
	
	for(let i in arr[0]){
		if(Number(i) !== 0 && i%3 === 0) str += ','
		str += arr[0][i]
	}
	
	if(number.endsWith('.')) str += '.'
	if(arr[1]) str += '.'+arr[1]
	
	return str
}
	
updateDisplay() {
    this.currentTextElement.innerText =
      this.getDisplayNumber(this.current)
    if (this.operation) {
      this.previousTextElement.innerText =
        `${this.getDisplayNumber(this.previous)} ${this.operation}`
    } else {
      this.previousTextElement.innerText = ''
    }
  }
}

const numberButtons = document.querySelectorAll('[data-number]')
const operationButtons = document.querySelectorAll('[data-operation]')

const equalsButton = document.querySelector('[data-equals]')
const deleteButton = document.querySelector('[data-delete]')
const clearButton = document.querySelector('[data-clear]')

const previousTextElement = document.querySelector('[data-previous]')
const currentTextElement = document.querySelector('[data-current]')



const calculator = new Calculator(previousTextElement, currentTextElement)


numberButtons.forEach(button => {
  button.addEventListener('click', () => {
    calculator.appendNumber(button.innerText)
    calculator.updateDisplay()
  })
})

operationButtons.forEach(button => {
  button.addEventListener('click', () => {
    calculator.chooseOperation(button.innerText)
    calculator.updateDisplay()
  })
})

equalsButton.addEventListener('click', button => {
  calculator.compute()
  calculator.updateDisplay()
})

clearButton.addEventListener('click', button => {
  calculator.clear()
  calculator.updateDisplay()
})

deleteButton.addEventListener('click', button => {
  calculator.delete()
  calculator.updateDisplay()
})
              
            
!
999px

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