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HTML

            
              <div class="moveright" align="right">
<div class="calculator">
  <p id="title">FreeCodeCamp</p>
  <p id="tagline">HandCoded Calculator</p>
  <input type="text" disabled="disabled" id="display"/>
  <div class="row">
    <button class="ctrl" onClick="allClearAC()">AC</button>
    <button class="ctrl" onClick="clearCE()">CE</button>
    <button onClick="operate('/100')">%</button>
    <button onClick="operate('/')">÷</button>
  </div>
  <div class="row">
    <button onClick="addDigit(7)">7</button>
    <button onClick="addDigit(8)">8</button>
    <button onClick="addDigit(9)">9</button>
    <button onClick="operate('*')">x</button>
  </div>
  <div class="row">
    <button onClick="addDigit(4)">4</button>
    <button onClick="addDigit(5)">5</button>
    <button onClick="addDigit(6)">6</button>
    <button onClick="operate('-')">-</button>
  </div>
  <div class="row">
    <button value=1 onClick="addDigit('1')">1</button>
    <button onClick="addDigit('2')">2</button>
    <button onClick="addDigit('3')">3</button>
    <button class="tall" onClick="operate('+')">+</button>
  </div>
  <div class="row">
    <button onClick="addDigit('0')">0</button>
    <button onClick="addDigit('.')">.</button>
    <button onClick="workout()">=</button>
    
  </div>
</div>
</div>
!

CSS

            
              @import url(https://fonts.googleapis.com/css?family=Pacifico|Open+Sans|Montserrat);
body, html {
   background:url("https://images.unsplash.com/photo-1453733190371-0a9bedd82893?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&w=1080&fit=max&s=bcfa2aedb65f1d4bda7ee0cfd7f6932c")no-repeat fixed;
  background-size:cover;
  
  margin-top: 8%;
    margin-left:40%;
}

.calculator {
  width: 250px;
  height: 335px;
  background-color: #F3EEE7;
  margin: 0 auto;
  border-top-left-radius: 80% 20px;
  border-top-right-radius: 80% 20px;
  border-bottom-left-radius: 80% 20px;
  border-bottom-right-radius: 80% 20px;
  box-shadow: inset 5px 0 10px -5px #635e61, inset -5px 0 10px -5px #635e61, inset 0px -5px 10px -2px #635e61, 0 0 1px 2px #635e61, 0 10px 20px 0 #494547;
  text-align: center;
}
.calculator p#title {
  padding-top: 10px;
  margin-bottom: -10px;
  color: #7d777b;
  font-family: 'Pacifico';
}
.calculator p#tagline {
  text-transform: uppercase;
  color: #969194;
  font-family: 'Open Sans';
  font-size: .7em;
}
.calculator input[type='text'] {
  background-color: #C7C7B0;
  border: 1px solid #b2b292;
  line-height: 40px;
  width: 80%;
  font-size: 2em;
  text-align: right;
  font-family: 'Montserrat';
  padding-right: 10px;
  margin-bottom: 20px;
  border-radius: 5px;
  box-shadow: inset 0px -2px 10px #b2b292;
}
.calculator input[type='text']:focus {
  outline: none;
}
.calculator .row {
  display: block;
}
.calculator .row button {
  width: 40px;
  height: 30px;
  border: 1px solid #4B4657;
  border-top: 2px solid #7c748f;
  background-image: -webkit-linear-gradient( top , #4B4657, #332f3b);
  background-image: linear-gradient(to bottom, #4B4657, #332f3b);
  color: white;
  font-size: 1.1em;
  border-radius: 20%;
  border-top-left-radius: 80% 10px;
  border-top-right-radius: 80% 10px;
  border-bottom-left-radius: 100% 10px;
  border-bottom-right-radius: 100% 10px;
  margin-left: 5px;
  margin-right: 5px;
  margin-bottom: 8px;
  box-shadow: inset 0 1px 4px #7c748f, inset 0 -4px 20px #332f3b, 0 3px 1px 0 #332f3b;
}
.calculator .row button:focus {
  outline: 0;
}
.calculator .row button:active {
  background-image: -webkit-linear-gradient( bottom , #4B4657, #332f3b);
  background-image: linear-gradient(to top, #4B4657, #332f3b);
}
.calculator .row .ctrl {
  border: 1px solid #CC4E5F;
  border-top: 2px solid #e39da7;
  background-image: -webkit-linear-gradient( top , #CC4E5F, #b33445);
  background-image: linear-gradient(to bottom, #CC4E5F, #b33445);
  box-shadow: inset 0 1px 4px #e39da7, inset 0 -4px 20px #b33445;
}
.calculator .row .ctrl:active {
  background-image: -webkit-linear-gradient( bottom , #CC4E5F, #b33445);
  background-image: linear-gradient(to top, #CC4E5F, #b33445);
}
.calculator .row .tall {
  height: 65px;
  float: right;
  margin-right: 24px;
  margin-left: -8px;
}
!

JS

            
              // Caculator
var memory = '';
var current = '';
var MAX = '10';
var op = '';
var display = document.getElementById("display");
var lasData = [];

function allClearAC(){ 
  memory = '';
  current = '';
  op = '';
  display.value = current;
}  // Clear all the digits on screen
function clearCE(){
  memory =  memory.substr(0, memory.length-1);
  display.value = memory;
}

function addDigit(dig){
 
  if ( current.length > MAX) { 
    current = "Too Large"
    display.value = current;
    } else {current = dig;}
     
    memory = memory + current;
    display.value = memory;
  
} 

function operate(op){
  memory = memory + op; 
  current = '';
  display.value = memory;
  
} 

function workout(){
    current = eval(memory);
    display.value = current; 
  
    oper = 0;
    memory= '';
  
}
!
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