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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              	<div class="container">
      <div class="calculator">
        <div class="calculator-display">0</div>
        <div class="calculator-keyboard">
          <div class="calculator-keyboard_container_numbers">
            <button class="calculator-keyboard_number_key" type="button" data-keycode="67" value="clear">C</button>
            <button class="calculator-keyboard_number_key" type="button" data-keycode="84" value="toggle">&#8314;&#8725;&#8331;</button>
            <button class="calculator-keyboard_number_key" type="button" data-keycode="88" value="exponent">%</button>
            <button class="calculator-keyboard_number_key" type="button" data-keycode="190" value=".">.</button>
            <button class="calculator-keyboard_number_key" type="button" data-keycode="48" value="0">0</button>
            <button class="calculator-keyboard_number_key" type="button" data-keycode="49" value="1">1</button>
            <button class="calculator-keyboard_number_key" type="button" data-keycode="50" value="2">2</button>
            <button class="calculator-keyboard_number_key" type="button" data-keycode="51" value="3">3</button>
            <button class="calculator-keyboard_number_key" type="button" data-keycode="52" value="4">4</button>
            <button class="calculator-keyboard_number_key" type="button" data-keycode="53" value="5">5</button>
            <button class="calculator-keyboard_number_key" type="button" data-keycode="54" value="6">6</button>
            <button class="calculator-keyboard_number_key" type="button" data-keycode="55" value="7">7</button>
            <button class="calculator-keyboard_number_key" type="button" data-keycode="56" value="8">8</button>
            <button class="calculator-keyboard_number_key" type="button" data-keycode="57" value="9">9</button>
          </div>
          <div class="calculator-keyboard_container_operators">
            <button class="calculator-keyboard_operator_key" type="button" data-keycode="47" value="div">÷</button>
            <button class="calculator-keyboard_operator_key" type="button" data-keycode="221" value="mult"><span>×</span></button>
            <button class="calculator-keyboard_operator_key" type="button" data-keycode="189" value="subtract">−</button>
            <button class="calculator-keyboard_operator_key" type="button" data-keycode="187" value="sum">+</button>
            <button class="calculator-keyboard_operator_key" type="button" data-keycode="13" value="result">=</button>
          </div>
        </div>
      </div>
    </div>

            
          
!
            
              @import url('https://fonts.googleapis.com/css?family=Roboto:100,300,400');

body {
  background: #000;
}

.container {
  margin-top: 100px;
  margin-bottom: 25px;
  left: 50%;
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
}

/* Fixed px on height and width. Position buttons within using flexbox */

.calculator {
  align-content: flex-start;
  align-items: flex-start;
  background-color: #202020;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  font-family: 'Roboto', sans-serif;
  height: 550px;
  justify-content: flex-start;
  margin: 0 auto;
  overflow: hidden;
  width: 340px;
}

/* Button defaults */

.calculator button {
  border: 0;
  cursor: pointer;
  display: block;
  font-size: 32px;
  font-weight: 300;
  height: 85px;
  line-height: 85px;
  margin-left: 0;
  padding: 0;
  text-align: center;
  width: 85px;
  transition: opacity .2s ease-out;
  font-family: 'Roboto', sans-serif;
}

.calculator button:hover{
  opacity: .9;
}

.calculator button:active, .calculator button.active{
  opacity: .8;
}

/* Display area */

.calculator-display {
  color: white;
  flex-grow: 1;
  font-size: 87px;
  font-weight: 100;
  height: 85px;
  line-height: 67px;
  padding-right: 10px;
  padding-top: 40px;
  text-align: right;
}

/* Brief blink animation */

.blink {
  animation: blinker .1s linear 1;
}

@keyframes blinker {  
  50% { 
    opacity: 0; 
  }
}

/* Flex keyboard layout */

.calculator-keyboard {
  align-content: flex-start;
  align-items: flex-start;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: flex-start;
}

/* Number keys (0-9, C, +/-, %) */

.calculator-keyboard_container_numbers {
  align-content: flex-start;
  align-items: flex-start;
  display: flex;
  flex-basis: 75%;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: flex-start;
}

button.calculator-keyboard_number_key {
  background-color: #c7c7c7;
  color: #424346;
  outline: 1px solid #949599;
}

/* Specific alignment for "0" key */

button.calculator-keyboard_number_key[value="0"]{
  margin-left: none;
  padding-left: 1.05em;
  text-align: left;
}

/* C, +/- and % */

button.calculator-keyboard_number_key:nth-child(-n+3) {
   background-color: #afb0b5;
   font-size: 26px;
}

/* Operator (orange) keys */

.calculator-keyboard_container_operators {
  flex-basis: 25%;
}

button.calculator-keyboard_operator_key {
  background-color: #f98410; 
  color: #fff6f9;
  flex-grow: 1;
  font-size: 36px;
  outline: 1px solid #ca5200;
  font-weight: 100;
}

/* Fix for uncentered 'x' char (due to font selection) */
button.calculator-keyboard_operator_key span{
 position: relative;
 top: -5px;
}

/* Button order */

.calculator-keyboard button[value="."] {
  order: 11;
}
.calculator-keyboard button[value="0"] {
  order: 10;
  flex-grow: 2;
}
.calculator-keyboard button[value="1"] {
  order: 7;
}
.calculator-keyboard button[value="2"] {
  order: 8;
}
.calculator-keyboard button[value="3"] {
  order: 9;
}
.calculator-keyboard button[value="4"] {
  order: 4;
}
.calculator-keyboard button[value="5"] {
  order: 5;
}
.calculator-keyboard button[value="6"] {
  order: 6;
}
.calculator-keyboard button[value="7"] {
  order: 1;
}
.calculator-keyboard button[value="8"] {
  order: 2; 
}
.calculator-keyboard button[value="9"] {
  order: 3;
}
            
          
!
            
              /* 
    My attempt to clone an iPhone calculator
*/


let calculator = {
  
    // Initialise defaults
    data: {
      maxChars: 10,
      storedResult: null,
      currentValue: '0',
      currentOperation: null,

    // Map the keys
    mapKeys: { 
      48 : { type: 'input', value:  '0' },
      49 : { type: 'input', value:  '1' },
      50 : { type: 'input', value:  '2' },
      51 : { type: 'input', value:  '3' },
      52 : { type: 'input', value:  '4' },
      53 : { type: 'input', value:  '5' },
      54 : { type: 'input', value:  '6' },
      55 : { type: 'input', value:  '7' },
      56 : { type: 'input', value:  '8' },
      57 : { type: 'input', value:  '9' },
      190: { type: 'input', value:  '.' },
      88 : { type: 'operation', value:  'exponent' },
      47 : { type: 'operation', value:  'division' },
      221: { type: 'operation', value:  'multiply' },
      189: { type: 'operation', value:  'subtract' },
      187: { type: 'operation', value:  'sum' },
      67 : { type: 'clear', value:  'clear' },
      13 : { type: 'result', value:  null },
      8  : { type: 'delete', value:  null },
      84 : { type: 'toggle', value:  'toggle' },
    },
  },
  
  // Receive keyboard input (via data-keycode) & press the corresponding button

  activateButtonWithKeypress (keyCode){
    const chooseBtn = document.querySelectorAll(`.calculator button[data-keycode="${keyCode}"]`)[0];
    if (chooseBtn) {
      chooseBtn.classList.toggle('active');
      setTimeout(() => {
        chooseBtn.classList.toggle('active');
      }, 150);
    }
  },
  
  // Select all buttons & map to corresponding type

  bindButtons () {
    const buttons = document.querySelectorAll('.calculator button');
    const mapKeys = calculator.data.mapKeys;
    Array.from(buttons).forEach((button) => {
      button.addEventListener('click', (event) => {
        this.processUserInput(mapKeys[event.target.dataset.keycode])
      });
    });
  },
  
  bindKeyboard () {
    document.addEventListener('keydown', (event) => {
      const mapKeys = calculator.data.mapKeys;
      let keyCode = event.keyCode

      // binds shift + 7 to 'divide by'
      if (keyCode === 55 && event.shiftKey) {
        keyCode = 47;
      }
      if (mapKeys[keyCode]) {
        this.processUserInput(mapKeys[keyCode])
        this.activateButtonWithKeypress(keyCode)
      }
    });
  },
  
  // Blinks display content when numbers are pressed

  blinkDisplay () {
    const blinkDisplay = document.querySelector('.calculator-display')
    blinkDisplay.classList.toggle('blink')
    setTimeout(() => {
      blinkDisplay.classList.toggle('blink')
    }, 150);
  },

  // Perform the calculation!
  
  calculate () {
    // Initialise and convert input to number
    const oldValue = parseFloat(this.data.storedResult, 10)
    const operation = this.data.currentOperation
    const newValue = parseFloat(this.data.currentValue, 10)
    let resultValue = 0

    // Performs calculation of numbers determined by operator value
    if (this.data.currentOperation === 'multiply') {
      resultValue = oldValue * newValue;
    }
    if (this.data.currentOperation === 'division') {
      resultValue = oldValue / newValue;
    }
    if (this.data.currentOperation === 'subtract') {
      resultValue = oldValue - newValue;
    }
    if (this.data.currentOperation === 'sum') {
      const multiplierFix = 1000000000;
      // resultValue = oldValue + newValue;
      resultValue = (((oldValue * multiplierFix) + (newValue * multiplierFix)) / multiplierFix)
    }
    if (this.data.currentOperation === 'exponent') {
      resultValue = Math.pow(oldValue, newValue);
    }
    this.data.storedResult = null;
    this.data.currentValue = '' + resultValue;
    this.updateDisplay();
  },
  
  // Resets defaults and clears display for 'C' button
  clearAll () {
    this.data.currentOperation = null;
    this.data.storedResult = null;
    this.data.currentValue = '0';
    this.updateDisplay();
  },
  
  // Resets current value
  clearCurrentValue () {
    this.data.currentValue = '0';
    this.updateDisplay();
  },
  
   // Removes last entered number if backspaced
  deleteNumber () {
    const newValue = this.data.currentValue.slice(0, -1);
    if (newValue === '') {
      this.blinkDisplay();
      this.clearCurrentValue();
    } else {
      this.data.currentValue = newValue;
      this.updateDisplay();
    }
  },
  
  // Receives user input type and launches corresponding function

  processUserInput (userInput) {
    if (userInput.type === 'input') {
      this.setNumber(userInput.value)
    }
    if (userInput.type === 'operation') {
      this.setOperation(userInput.value)
    }
    if (userInput.type === 'delete') {
      this.deleteNumber();
    }
    if (userInput.type === 'result') {
      this.showResult();
    }
    if (userInput.type === 'clear') {
      this.clearAll();
    }
    if (userInput.type === 'toggle') {
      this.toggleNumber();
    }
  },
  
  // Blinks display as required to prompt user

  setNumber (newNumber) {
    let currentValue = this.data.currentValue;
    if (newNumber === '.' && currentValue.includes('.')) {
      this.blinkDisplay();
      return;
    } 
    if (currentValue.length === this.data.maxChars) {
      this.blinkDisplay();
      return;
    }
    if (currentValue === '0' && newNumber === '.') {
      currentValue = '0.'
    } else if (currentValue === '0' && newNumber !== '.') {
      this.blinkDisplay();
      currentValue = newNumber
    } else {
      currentValue += newNumber
    }
    this.data.currentValue = currentValue
    this.updateDisplay()
  },
  
  // Selects operator for calculation

  setOperation (newOperation) {
    if (this.data.currentOperation !== null && this.data.storedResult !== null) {
      this.calculate()
    }
    this.data.storedResult = this.data.currentValue;
    this.data.currentValue = '0'
    this.data.currentOperation = newOperation;
  },
  
  // When "=" is pressed, perform calculation and update the display

  showResult () {
    if (this.data.storedResult !== null) {
      this.calculate()
      this.updateDisplay();

      // if null "=" was pressed first
    } else {
      this.blinkDisplay();
    }
  },
  
  // When toggle button is pressed, toggle negative '-'
  toggleNumber () {
    this.data.currentValue = (parseFloat(this.data.currentValue, 10) * -1) + '';
    this.updateDisplay();
  },
  
  // Add current value to display class
  updateDisplay () {
    document.querySelector('.calculator-display').innerHTML = this.data.currentValue
  },
  
  // Function to initialise display and bindings
  start () {
    this.updateDisplay();
    this.bindKeyboard();
    this.bindButtons();
  },
    
}

// Start the app
calculator.start()
            
          
!
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