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CSS

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HTML 

              
                <!DOCTYPE html>
<html>
  <head>
    <title>8bit Calculator</title>
    <meta name="description" content="A cool thing made">
    <link id="favicon" rel="icon" href="public/cal.ico" type="image/x-icon">
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="public/style.css">
  </head>
  <body>


    <main>
  <header>
      <h1>
        Electronic Calculator
      </h1>
    </header>
       <form>
         <div class="top">
           <div>
                <input class="screen"  type="text" maxlength="100" placeholder="0">
           </div>
           <div class="ticker"></div>
          </div>
          <div class="mid">
            <div class="operator">
                <!-- operators go here -->
            </div>
          </div>
        </form>
    </main>

    <!-- Yourdiv web-app is https, so your scripts need to be too -->
    <script src="https://code.jquery.com/jquery-2.2.1.min.js"
            integrity="sha256-gvQgAFzTH6trSrAWoH1iPo9Xc96QxSZ3feW6kem+O00="
            crossorigin="anonymous"></script>
    <script src="public/client.js"></script>

  </body>
</html>
!

CSS 

              
                /* styles */
/* called by your view template */

/* You might want to try something fancier: */
/* less: http://lesscss.org/ */

* {
  box-sizing: border-box;
}

body {
  font-family: helvetica, arial, sans-serif;
  margin: 25px;
}

h1 {
  font-weight: bold;
  color: pink;
}

.bold {
  font-weight: bold;
}

p {
  max-width: 600px;
}

form {
  margin-bottom: 25px;
  padding: 15px;
  background-color: cyan;
  display: inline-block;
  width: 100%;
  max-width: 340px;
  border-radius: 3px;
}

input {
  display: block;
  margin-bottom: 10px;
  padding: 5px;
  width: 100%;
  border: 1px solid lightgrey;
  border-radius: 3px;
  font-size: 16px;
}

button {
  font-size: 16px;
  border-radius: 3px;
  background-color: lightgrey;
  border: 1px solid grey;
  box-shadow: 2px 2px teal;
  padding:10px 15px;
  cursor: pointer;
  width: 50px;
}
button.double { 
  padding:10px 30px; 
}
button.double.long { 
  padding: 35px 15px 40px 15px;
}
button.double.lat { 
    padding-top: 10px;
    padding-right: 65px;
    padding-bottom: 10px;
    padding-left: 65px;
}
.yellow{ 
  background-color: yellow
}
button:hover {
  background-color: yellow;
}

button:active {
  box-shadow: none;
}

li {
  margin-bottom: 5px;
}

footer {
  margin-top: 50px;
  padding-top: 25px;
  border-top: 1px solid lightgrey;
}

footer > a {
  color: #BBBBBB;
}

.nicejob {
  text-decoration: line-through;
}

.screen{
  width:100%;
  line-height:40px ; 
  font-size:2em;
  height:40px;
  text-align:right;

}
.ticker{

  text-align:right;
}
.operator{
  font-size:1.5em;
  font-weight:bold;
  float:left;
}
.operator div {
  padding:10px; 
  min-width: 77.5px;
  float:left;
}
main{
    width: 340px;
    margin: 0 auto;
}
.zero{
  margin-top: -55px;
}
.point{
  margin-top: -55px;
}
@media only screen and (max-width: 400px) {
    button {
      font-size: 16px;
      border-radius: 3px;
      background-color: lightgrey;
      border: 1px solid grey;
      box-shadow: 2px 2px teal;
      padding:7px 7px;
      cursor: pointer;
      min-width: 40px;
    }
  .operator div {
    padding:10px; 
    min-width: 77.5px;
    float:left;
  }
  
}
!

JS 

              
                // client-side js
// run by the browser each time your view template is loaded

// by default, you've got jQuery,
// add other scripts at the bottom of index.html

$(function() {
 
 // model
 var data = {
     init: function(){
 
       this.data  = [];
       this.operations  = [];
       this.lastEntry;
     }, 
     keypad: {  
                          0:{v: 'AC', type: "operators", style: "single", pos: "long", custom: ""},
                          1:{v: 'CE', type: "operators", style: "single", pos: "long", custom: ""},
                          2:{v: '/', type: "operators", style: "single", pos: "long", custom: ""},
                          3:{v: '*', type: "operators", style: "single", pos: "long", custom: ""},
                          4:{v: 7, type: "digit", style: "single", pos: "long", custom: ""},
                          5:{v: 8, type: "digit", style: "single", pos: "long", custom: ""},
                          6:{v: 9, type: "digit", style: "single", pos: "long", custom: ""},
                          7:{v: '-', type: "operators", style: "single", pos: "long", custom: ""},
                          8:{v: 4, type: "digit", style: "single", pos: "long", custom: ""},
                          9:{v: 5, type: "digit", style: "single", pos: "long", custom: ""},
                          10:{v: 6, type: "digit", style: "single", pos: "long", custom: ""},
                          11:{v: '+', type: "operators", style: "single", pos: "long", custom: ""},
                          12:{v: 1, type: "digit", style: "single", pos: "long", custom: ""},
                          13:{v: 2, type: "digit", style: "single", pos: "long", custom: ""}, 
                          14:{v: 3, type: "digit", style: "single", pos: "long", custom: ""}, 
                          15:{v: '=', type: "operators", style: "double yellow ", pos: "long", custom: ""},
                          16:{v: 0, type: "digit", style: "double", pos: "lat", custom: " zero "}, 
                          17:{v: '.', type: "digit", style: "single", pos: "long", custom: " point "},   
              },
     getkeypad: function(){
          return this.keypad;
     }
       
 };

 //controller
    var octopus = {
        init: function() {
            data.init();
            view.init();
        },
        tempValue:0,
        addEntry: function(v, operator) {
            
            if( v === 'CE'){
               (data.operations.pop());
            }
            else if (v === "=" && data.operations.length > 0) {
                  (this.sum());   
            } else {
                if (data.operations.length > 0 // array > 0
                    &&
                    (Array.isArray(data.operations[(data.operations.length - 1)]) === false)) { //last entry is not array
                    if (operator) { //if new entry is an operator
                        data.operations.push([v]);
                    } else {
                        data.operations[(data.operations.length - 1)] = data.operations[(data.operations.length - 1)].toString() + v.toString();
                    }
                } else {

                    if(v === "."){
                          v = '0' + v.toString();
                    }
                  
                    operator && v !== 0 ? data.operations[(data.operations.length - 1)] = ([v]) : data.operations.push(v);
                }
            }
        },
        getOperation: function(v) {
            if( v === 'AC'){
              data.init();
            }else if(v === '='){
              return this.tempValue;          
            }else if (data.operations.length > 0) {
                if (Array.isArray(data.operations[(data.operations.length - 1)])) {
                    return data.operations[data.operations.length - 1];
                } else {
                    return data.operations[data.operations.length - 1];
                }
            } else {
                return "";
            }
        },
        getEntries: function() {
            var tickerString = data.operations.map(function(v, i) {
                v = Array.isArray(v) ? v[0] : v;
                return v;
            });
            return tickerString.join(" ")
        },
        sum: function(v) {
            var expression = data.operations.map(function(v, i) {
                v = Array.isArray(v) ? v[0] : v;
                return v;
            }); 
            console.log(expression)
            this.tempValue = eval(expression.join(" "));

        }
    };

    // html view 
    var view = {

        init: function() {
            this.displayKeypad();
        },
        handle: '.operator',
        screen: '.screen',
        notifier: '.notify',
        ticker: '.ticker',
        notify: function(msg) {},
        displayKeypad: function() {

            var keypad = data.getkeypad();
            var html = '';
            for (var i = 0; i < Object.keys(keypad).length; i++) {
                var key = Object.keys(keypad)[i];
                html += '<div class="'  + keypad[key].custom + '"><button data-v="' + keypad[key].v + '" class="keypad ' + keypad[key].type + ' ' + keypad[key].pos + ' ' + keypad[key].style + '" >' + keypad[key].v + '</button></div>';
            };

            $(this.handle).append(html);
            $(this.handle).find('.keypad').on({
                'click': function(e) {
                    e.preventDefault();
                    octopus.addEntry($(this).text(), $(this).hasClass('operators'));

                    // update screen
                     view.displayScreen(octopus.getOperation($(this).text()));
                     view.updateTicker();
                }
            });

        },
        displayScreen: function(entry) {
            $(this.screen).val(entry);
        },
        updateTicker: function() {
            $(this.ticker).text(octopus.getEntries());
        }
    };

    octopus.init();

});
!
999px

Console