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              <div id="help" class="blur_layer">
  <div class="transparent_background"></div>
  <div class="modal_window">
  <p>This web calculator has been made by Edgar S. Hurtado as part of the freeCodeCamp challenges</p>
  <br>
  <p>Personal website: <a href="http://edgarsh.es" target="_blank">edgarsh.es</a></p>
  <p>Twitter: <a href="https://twitter.com/edgarshurtado" target="_blank">@edgarshurtado</a></p>
  </div>
</div>

<div id="calc_body">
  <img id="logo" src="https://raw.githubusercontent.com/FreeCodeCamp/FCCAssets/master/Logos%20and%20Covers/freeCodeCamp-onBrown-1200.png" alt="" />
  <div id="display">
    <p id="displayNumbers">
      <span id="sign"></span>
      <span id="number">0</span>
    </p>
  </div>

  <table id="buttons_pad">
    <tr>
      <td id="c" class="button dark_brown">C</td>
      <td id="del" class="button dark_brown" colspan="2">DEL</td>
      <td class="button operational_button dark_brown">^</td>
      <td id="help_button" class="button operational_button dark_brown">?</td>
    </tr>
    <tr>
      <td class="button numeric_button light_brown">7</td>
      <td class="button numeric_button light_brown">8</td>
      <td class="button numeric_button light_brown">9</td>
      <td class="button operational_button dark_brown">+</td>
      <td class="button operational_button dark_brown">%</td>
    </tr>
    <tr>
      <td class="button numeric_button light_brown">4</td>
      <td class="button numeric_button light_brown">5</td>
      <td class="button numeric_button light_brown">6</td>
      <td class="button operational_button dark_brown">-</td>
      <td class="button operational_button dark_brown">√</td>
    </tr>
    <tr>
      <td class="button numeric_button light_brown">1</td>
      <td class="button numeric_button light_brown">2</td>
      <td class="button numeric_button light_brown">3</td>
      <td class="button operational_button dark_brown">*</td>
      <td class="button operational_button dark_brown">/</td>
    </tr>
    <tr>
      <td id="change_sign" class="button light_brown">&plusmn;</td>
      <td class="button numeric_button light_brown">0</td>
      <td class="button numeric_button light_brown">.</td>
      <td id="equal_button" class="button dark_brown" colspan="2">=</td>
    </tr>
  </table>
</div>
            
          
!
            
              * {
    margin:0;
    padding:0;
}
#calc_body {
    position: fixed;
    top: 15%;
    left: 35%;
    background-color: #4a2b0f;
    height:490px;
    width: 445px;
}

#logo {
    height: 30px;
    margin-left: 8px;
}

#display {
    margin-left: 15px;
    width: 417px;
    height: 82px;
    background-color: rgb(155, 243, 255);
}

#display p {
    position: relative;
    top: 15px;
    right: 10px;
    font-size: 3em;
    color: rgb(51, 96, 102);
    text-align: right;
}

#buttons_pad {
    text-align: center;
    margin-left: 5px;
    border-spacing: 10px;
    color: white;
}

.button {
    width: 75px;
    height: 62px;
    font-size: 2em;

    -webkit-box-shadow: 0 8px 6px -6px black;
    -moz-box-shadow: 0 8px 6px -6px black;
    box-shadow: 0 8px 6px -6px black;
}

.button:active {
    -moz-box-shadow:    inset 3px 3px 10px black;
    -webkit-box-shadow: inset 3px 3px 10px black;
    box-shadow:         inset 3px 3px 10px black;
}

.light_brown {
    background-color: rgb(191, 111, 40);
}

.dark_brown {
    background-color: rgb(134, 78, 27);
}

.blur_layer{
    position:fixed;
    height:100%;
    width:100%;
    display: none;
    z-index: 3;
}

.transparent_background{
    height:100%;
    width:100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal_window{
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    z-index: 1;
    background-color: white;
    padding: 15px 5px 15px 5px;
    border-radius: 15px;
}

.modal_window p{
    margin: 5px 5px 5px 5px;
}

            
          
!
            
              //TODO: When the sign is changed the result is not displayed properly

/*jslint browser: true*/
/*global $, jQuery, alert*/

// --------------------
//      CALC LOGIC
// --------------------

var calcObject;
calcObject = {
  operand1: null,
  operand2: null,
  activeOperator: null,
  lastButton: "",

  // Sets the operand in the calc. If there's no activeOperator, the number
  // is sets to the operand1, if there is it sets to the operand2
  setOperand: function(number) {
    if (this.activeOperator === null) {
      this.operand1 = number;
    } else {
      this.operand2 = number;
    }
  },

  setActiveOperator: function(operatorSymbol) {
    this.activeOperator = operatorSymbol;
  },

  addition: function() {
    return this.operand1 + this.operand2;
  },

  percent: function() {
    return this.operand1 * this.operand2 / 100;
  },

  substraction: function() {
    return this.operand1 - this.operand2;
  },

  sqrt: function() {
    return Math.sqrt(this.operand1);
  },

  multiplication: function() {
    return this.operand1 * this.operand2;
  },

  division: function() {
    return this.operand1 / this.operand2;
  },

  pow: function() {
    return Math.pow(this.operand1, this.operand2);
  },

  solve: function() {
    var solution = this[this.activeOperator]();
    solution = parseFloat(parseFloat(solution).toPrecision(15));
    this.resetOperands();
    return solution;
  },

  resetOperands: function() {
    this.operand1 = null;
    this.operand2 = null;
    this.activeOperator = null;
  },

  operationReady: function() {
    if (this.activeOperator === "sqrt") {
      // The square root is special because it requires just 1 operand
      return this.operand1 !== null;
    }
    return this.operand1 !== null && this.operand2 !== null && this.activeOperator !== null;
  }
};

// ------------------------------
// GUI Logic
// ------------------------------

// -- Delete current number in display --
function deleteCurrentNumber() {
  $('#number').text('0');
  $('#sign').text('');
}

function printNumber(num) {
  var $numberHolder = $('#number');
  var $signHolder = $('#sign');

  if (num < 0) {
    $signHolder.text("-");
    num = num * (-1);
  } else {
    $signHolder.text("");
  }

  num = num.toString().slice(0, 15);

  $numberHolder.text(num);
}

// Parse the display number
function parseDisplayNumber() {
  var numberString = $('#sign').text() + $('#number').text();
  var parsedNumber;

  if (numberString.indexOf(".") !== -1) {
    parsedNumber = parseFloat(numberString);
  } else {
    parsedNumber = parseInt(numberString, 10);
  }
  return parsedNumber;
}

// Introducing numbers to the display control
function addNumberToDisplay(newNumber) {
  var $number = $('#number');
  var $sign = $('#sign');
  var currentNumber = $sign.text() + $number.text();
  if (currentNumber === '0' || calcObject.lastButton.indexOf('operational_button') !== -1 || calcObject.lastButton === "equal_button") {
    if (calcObject.lastButton === "change_sign") {
      // In case the user hits the change_sign button just right after
      // hitting an operational button because he wants a negative number
      // as second operand.
      printNumber(newNumber);
    } else if (newNumber === '.') {
      printNumber("0.");
    } else {
      deleteCurrentNumber();
      printNumber(newNumber);
    }
  } else if (currentNumber.length < 15) {
    printNumber(currentNumber + newNumber);
  }
}

// Checks if the operation is ready and then solves it
function solveCurrentOperation() {
  if (calcObject.operationReady()) {
    var solution = calcObject.solve();
    calcObject.resetOperands();
    printNumber(solution);
  }
}

// ------------------------------
// BUTTONS EVENTS
// ------------------------------

// Introduce numbers by clicking
$(".numeric_button").click(function() {
  var $this = $(this);
  if ($this.text() !== '.' || $('#number').text().indexOf('.') === -1) {
    addNumberToDisplay($this.text());
  }
  calcObject.lastButton = $this.attr('class');
});

// -- Delete current number in display --
$('#c').click(deleteCurrentNumber);

// -- Reset the calculator --
$('#del').click(function() {
  calcObject.resetOperands();
  deleteCurrentNumber();
});

// +- button
$("#change_sign").click(function() {
  var $sign = $('#sign');
  var currentSign = $sign.text();

  if (calcObject.lastButton.indexOf("operational_button") !== -1 && calcObject.operand2 === null) {
    $sign.text("-");
    $('#number').text("0");
    calcObject.setOperand(parseDisplayNumber);
  } else {
    if (currentSign === "") {
      $sign.text("-");
    } else if (currentSign === "-") {
      $sign.text("");
    }
  }

  calcObject.lastButton = $(this).attr('id');
});

// Operational_buttons
$('.operational_button').click(function() {
  calcObject.setOperand(parseDisplayNumber());
  if (calcObject.operationReady()) {
    solveCurrentOperation();
    // In case we are concatenating operations, to set the result number as
    // operand1
    calcObject.setOperand(parseDisplayNumber());
  }

  var operationSymbol = $(this).text();

  switch (operationSymbol) {
    case '+':
      calcObject.setActiveOperator('addition');
      break;
    case '%':
      calcObject.setActiveOperator('percent');
      break;
    case '-':
      calcObject.setActiveOperator('substraction');
      break;
    case '√':
      calcObject.setActiveOperator('sqrt');
      solveCurrentOperation();
      break;
    case '*':
      calcObject.setActiveOperator('multiplication');
      break;
    case '/':
      calcObject.setActiveOperator('division');
      break;
    case '^':
      calcObject.setActiveOperator('pow');
      break;
    default:

  }
  calcObject.lastButton = $(this).attr('class');
});

$('#equal_button').click(function() {
  calcObject.setOperand(parseDisplayNumber());

  if (calcObject.operationReady()) {
    solveCurrentOperation();
  }

  calcObject.resetOperands();
  calcObject.lastButton = $(this).attr('id');
});

$('#help_button').click(function() {
  $('#help').show();
});

$('.transparent_background').click(function() {
  $('#help').hide();
});
            
          
!
999px
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