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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

              <p id="title"> Calculator </p>
<div id="calculator">
  <div id="screen"><p id="text"> </p> </div>
    <div id="cola">
      <button class="btn" name="1"> 1 </button> 
      <button class="btn" name="2"> 2 </button> 
      <button class="btn" name="3"> 3 </button>
      <button class="operation" name="+"> + </button>
      <button class="btn" name="4"> 4 </button>
      <button class="btn" name="5"> 5 </button>
      <button class="btn" name="6"> 6 </button>
      <button class="operation" name="-"> - </button>
      <button class="btn" name="7"> 7 </button>
      <button class="btn" name="8"> 8 </button>
      <button class="btn" name="9"> 9 </button>
      <button class="operation" name="*"> * </button>
      <button class="clear" name="AC"> AC </button>
      <button class="btn" name="0"> 0 </button> 
      <button class="btn" name="."> . </button>
      <button class="operation" name="/"> / </button>
      <button class="equal" name="="> = </button>
              @import url('https://fonts.googleapis.com/css?family=Indie+Flower');
  color: white;
  text-align: center;
  font-size: 7vmin;
  font-family: 'Indie Flower', cursive;
  width: 90%;
  height: 40px;
  position: relative;
  top: 20px;
  border-radius: 5px;
  background-color: black;
  margin: auto;
  background-color: black;
  padding-top: 8px;
  padding-left: 20px;
  font-size: 20px;
  color: white;
  background-color: grey;
  width: 300px;
  height: 350px;
  margin: auto;
  margin-top: 110px;
  border-radius: 20px;
  position: relative;
  margin-top: 30px;
  height: 270px;

#cola button{
  width: 45px;
  height: 34px;
  margin: 13px;
  margin-top: 20px;
  background-color: black;
  background-image: linear-gradient(135deg, white, white 10%, black 50%);
  border-radius: 10px;
  color: white;
  box-shadow: 0px 3px 4px 2px rgba(100,100,100,0.5);
  cursor: pointer;
  outline: none;
.operation:active, .btn:active, .clear:active{
  position: relative;
  top: 2px;
  box-shadow: none !important;
  position: absolute;
  top: 0;
  right: -1px;
  height: 40px !important;
Array []									Array[20,+]
1. Click number >>> Create a variable where you store this number 		Number: 
                >>> Display 							Variable: 40
                >>> Add the specific "name" of the button to variable

2. Click operation >>> If there is no number displayed(beginning) do nothing
		   >>> IF the length of the array is 2 then
			add number to array
			asign to array >> operation(array)
			add the current sign to array
                   >>> ELSE add to array the number and the sign
		   >>> Assign number with ""

3. Click = >>> Transform the value into a number and add it to the array
	   >>> Call operation function()
	   >>> number = ""

Create operation function(array);
$(document).ready(function() {
  //acumulator for the operation between any 2 numbers
  var acumulator = [];
  var number = "";
  //Used to determine if there was an '=' finished operation before
  var bool;
  //Adds to the current number displayed the digit you just pushed!:)
  //If there was any operation before, finished with an '=' this emptys the current number
  $(".btn").on("click", function(){
      number = "";
    bool = false;
    var digit = this.name;
    number += digit;
  //Does some MAGIC for the chain operations 
  $(".operation").on("click", function() {
    if (number !== "") {
      var sign = this.name;
      if(acumulator.length === 2){
        acumulator = operate(acumulator);
        number = acumulator[0];
        acumulator.push(number, sign);
    number = "";
  //Also MAGIC for the equal operator
    if((number !== "") && (acumulator.length === 2)){
      acumulator = operate(acumulator);
      number = acumulator[0].toString();
      bool = true;
      acumulator = [];
  //All Clear Button
    number = "";
  //Takes in an array of 3 elements, the sign being the middle one
  //Returns an array with only one element, the result of the operation beetwen the 2 in the beginning
  function operate(arr) {
    var result;
    arr[0] = parseFloat(arr[0]);
    arr[2] = parseFloat(arr[2]);
    switch (arr[1]) {
      case "+":
        result = arr[0] + arr[2];
        arr = [];
        arr[0] = result;
      case "*":
        result = arr[0] * arr[2];
        arr = [];
        arr[0] = result;
      case "/":
        result = arr[0] / arr[2];
        arr = [];
        arr[0] = result;
      case "-":
        result = arr[0] - arr[2];
        arr = [];
        arr[0] = result;
    return arr;
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