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              <div class="calculator">

  <div class="screen">
    <div class="screen-inner output"></div>
  </div>

  <div class="controls noselect">

    <div class="control-quarter">
      <div class="control all-clear" onclick="clearAll();">AC</div>
      <div class="control seven" onclick="addToInput(7);">7</div>
      <div class="control four" onclick="addToInput(4);">4</div>
      <div class="control one" onclick="addToInput(1);">1</div>
      <div class="control zero" onclick="addToInput(0);">0</div>
    </div>
    <div class="control-quarter">
      <div class="control clear-entry" onclick="clearInput();">CE</div>
      <div class="control eight" onclick="addToInput(8);">8</div>
      <div class="control five" onclick="addToInput(5);">5</div>
      <div class="control two" onclick="addToInput(2);">2</div>
      <div class="control decimal" onclick="addDecimalToInput();">.</div>
    </div>
    <div class="control-quarter">
      <div class="control percent">%</div>
      <div class="control nine" onclick="addToInput(9);">9</div>
      <div class="control six" onclick="addToInput(6);">6</div>
      <div class="control three" onclick="addToInput(3);">3</div>
      <div class="control equals" onclick="equals();">=</div>
    </div>
    <div class="control-quarter">
      <div class="control divide" onclick="division();">÷</div>
      <div class="control times" onclick="multiplication();">x</div>
      <div class="control minus" onclick="subtraction();">-</div>
      <div class="control plus" onclick="addition();">+</div>
    </div>

  </div>

</div>
            
          
!
            
              * {
  box-sizing: border-box;
}

body {
  background-color: #001222;
  color: white;
  padding: 30px;
}

.noselect {
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.calculator {
  border: 1px solid white;
  width: 440px;
  height: 440px;
  margin: 30px auto 0;
}

.screen {
  height: 80px;
  padding: 5px;
  border: 1px solid white;
  margin: 20px 20px 0;
  position: relative;
}

.screen-inner {
  position: absolute;
  bottom: 5px;
  font-size: 28px;
  font-family: monospace;
  width: 96.4%;
  text-align: right;
}

.controls {
  font-family: monospace;
  font-size: 2rem;
  padding: 20px;
  text-align: center;
}

.control-quarter {
  width: 20%;
  display: inline-block;
  vertical-align: top;
}

.control {
  width: 85px;
  height: 50px;
  line-height: 50px;
  text-align: center;
  border: 1px solid white;
  cursor: pointer;
  transition: 0.3s all;
  margin-bottom: 10px;
}

.control:hover {
  background-color: rgba(255, 255, 255, 0.06);
  transition: 0.3s all;
}

.plus {
  height: 110px;
  position: relative;
  line-height: 110px;
}

.percent {
  visibility: hidden;
}
            
          
!
            
              // Global Variables =============================+

var input = 0; // General input to be evaluated
var temp = ""; // Holds value to be evaluated

// Global Functions =============================+

// Update calculator
var updateCalculatorDisplay = function(n) {
  $('.output').text(n);
};

// Add to Input
var addToInput = function(n) {
  if (input == 0) {
    input = '' + n;
  } else {
    input += '' + n;
  }
  updateCalculatorDisplay(temp + input);
};

// Add decimal to Input
var addDecimalToInput = function() {
  if (input.indexOf(".") == -1) {
    input += '.';
    updateCalculatorDisplay(temp + input);
  }
};

// Division
var division = function() {
  temp += input + ' / ';
  input = 0;
  updateCalculatorDisplay(temp);
}

// Multiplication
var multiplication = function() {
  temp += input + ' * ';
  input = 0;
  updateCalculatorDisplay(temp);
}

// Subtraction
var subtraction = function() {
  temp += input + ' - ';
  input = 0;
  updateCalculatorDisplay(temp);
}

// Addition
var addition = function() {
  temp += input + ' + ';
  input = 0;
  updateCalculatorDisplay(temp);
}

// Equals
var equals = function() {
  temp += input;
  var result = math.eval(temp);
  updateCalculatorDisplay(temp + ' = ' + result);
  input = '';
  temp = '';
}

// Clear All
var clearAll = function() {
  input = 0;
  temp = '';
  updateCalculatorDisplay(input);
};

// Clear input
var clearInput = function() {
  input = 0;
  updateCalculatorDisplay(input);
}

// Document Ready ===============================+

$(document).ready(function() {

  // Initial output
  $('.output').text(input);

});
            
          
!
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