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              <!--
Inspired by https://dribbble.com/shots/723449-Calc-GUI
-->
<div class="calculator">
  <div class="textbox"></div>
  <div class="row">
    <div class="btn ac accent">AC</div>
    <div class="btn ce accent"><</div>
    <div class="btn divide">/</div>
    <div class="btn multiply">×</div>
  </div>
  <div class="row">
    <div class="btn 7">7</div>
    <div class="btn 8">8</div>
    <div class="btn 9">9</div>
    <div class="btn minus">-</div>
  </div>
  <div class="row">
    <div class="btn 4">4</div>
    <div class="btn 5">5</div>
    <div class="btn 6">6</div>
    <div class="btn plus">+</div>
  </div>
  <div class="row">
    <div class="btn 1">1</div>
    <div class="btn 2">2</div>
    <div class="btn 3">3</div>
    <div class="btn equal tall">=</div>
  </div>
  <div class="row">
    <div class="btn 0 wide">0</div>
    <div class="btn dot">.</div>
  </div>
</div>
            
          
!
            
              /* Box Sizing Fix */
html {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
*, *:before, *:after {
  -webkit-box-sizing: inherit;
  -moz-box-sizing: inherit;
  box-sizing: inherit;
  }
/* ------ */

$background-color: #B0D0D7;
$main-color: #F7F4ED;
$main-color-dark: #C4BFB3;
$secondary-color: #8D8F9A;
$text-color: #71625B;
$accent-color: #DB7542;
$highlight-color: #889DD3;
$shadow-color: #468594;

body {
  background: $background-color;
}

html * {
  font-family: 'Quicksand';
}

.calculator {
  width: 340px;
  height: 390px;
  background: $main-color;
  border-radius: 7px;
  box-shadow: 5px 10px 25px $shadow-color,
              inset 0px 4px 2px white,
              inset 0px -2px 7px $main-color-dark;
  border: 3px solid $main-color-dark;
  color: $text-color;
  font-size: 40px;
  font-family: sans-serif;
  font-weight: 700;
  padding: 20px;
  
  position: absolute;
  margin: auto;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.textbox {
  height: 70px;
  border: 2px solid #dcd9d2;
  box-shadow: 0px 4px 2px white;
  border-radius: 5px;
  background: linear-gradient(#e0d9ce, #f1ede6, #f7f4ef);
  line-height: 70px;
  text-align: right;
  padding: 0 10px;
  &::selection {
    background: $highlight-color;
    color: $main-color;
  }
}

.btn {
  display: inline-block;
  background: grey;
  width: 64px;
  height: 45px;
  margin-top: 10px;
  border: 2px solid #dfdcd7;
  box-shadow: inset 0px 3px 2px white,
    0px 1px 3px #d4d0ca;
  border-radius: 5px;
  background: $main-color;
  font-size: 20px;
  line-height: 45px;
  text-align: center;
  cursor: pointer;
  transition: all .1s ease;
  &:active{
    box-shadow: 0px 0px 3px #d4d0ca;
    background: darken($main-color, 3);
  }
  -webkit-user-select: none;  /* Chrome all / Safari all */
  -moz-user-select: none;     /* Firefox all */
  -ms-user-select: none;      /* IE 10+ */
  user-select: none;          /* Likely future */     
}

.btn.accent {
  border: 2px solid #b64811;
  box-shadow: inset 0px 4px 2px #f78e58,
    0px 1px 3px #d4d0ca;
  border-radius: 5px;
  color: $main-color;
  background: $accent-color;
  &:active{
    box-shadow: 0px 0px 3px #d4d0ca;
    background: darken($accent-color, 5);
  }
}

.btn.wide {
  width: 140px;
}

.btn.tall {
  height: 100px;
  margin: 10px 3px;
  float: right;
  line-height: 100px;
  font-size: 30px;
  background: $secondary-color;
  border: 2px solid darken($secondary-color, 10);
  box-shadow: inset 0px 4px 2px lighten($secondary-color, 10),
    0px 1px 3px #d4d0ca;
  color: $main-color;
  &:active{
    box-shadow: 0px 0px 3px #d4d0ca;
    background: darken($secondary-color, 5);
  }
}
            
          
!
            
              var entries = [];
var input = '';
var total = '';

$(".btn").click(function() {
  var val = $(this).text();

  //Add Number
  if (!isNaN(val) || val === '.') {
    input += val;
    $(".textbox").html(input.substring(0, 10));
  }

  //Backspace
  else if (val == "<") {
    input = input.substring(0, input.length - 1);
    $(".textbox").text(input);
  }

  //Clear All
  else if (val == "AC") {
    input = '';
    entries = [];
    total = 0;
    $(".textbox").text('')
  }

  //Operations
  else if (val == "+") {
    entries.push(input);
    entries.push("+");
    input = '';
  } else if (val == "-") {
    entries.push(input);
    entries.push("-");
    input = '';
  } else if (val == "/") {
    entries.push(input);
    entries.push("/");
    input = '';
  } else if (val == "×") {
    entries.push(input);
    entries.push("*");
    input = '';
  } else if (val == "=") {

    entries.push(input);
    var subtotal = Number(entries[0]);

    for (var i = 1; i < entries.length; i++) {
      var nextNumber = Number(entries[i + 1]);
      var operation = entries[i];

      if (operation === "+") {
        subtotal += nextNumber;
      } else if (operation === "-") {
        subtotal -= nextNumber;
      } else if (operation === "*") {
        subtotal *= nextNumber;
      } else if (operation === "/") {
        subtotal /= nextNumber;
      }

      i++;
    }

    // Swap the '-' symbol so text input handles it correctly
    if (subtotal < 0) {
      subtotal = Math.abs(subtotal) + '-';
    }

    total = String(subtotal).substring(0, 10);
    
    $(".textbox").html(total);
    entries = [];
    input = total;
  } else {
    entries.push(input);
    entries.push(val);
    input = '';
  }
})
            
          
!
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