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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

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About Vendor Prefixing

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We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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HTML 

              
                <html>
	<head>
		<title>Apple Calculator</title>
	</head>
	<body>
		<div class="wrapper">
		<div class="calc-body">
			<div class="readout">
				<span class="value" id="output">0</span>
			</div>
			<div id="button-panel" class="buttons">
				<div class="left-side">
					<button id="f-mp" class="small">m+</button>
					<button id="f-mm" class="small">m-</button>
					<button id="f-mc" class="small">mc</button>
					<button id="f-mr" class="small">mr</button>
					<button id="n-7" class="big">7</button>
					<button id="n-8" class="big">8</button>
					<button id="n-9" class="big">9</button>
					<button id="n-4" class="big">4</button>
					<button id="n-5" class="big">5</button>
					<button id="n-6" class="big">6</button>
					<button id="n-1" class="big">1</button>
					<button id="n-2" class="big">2</button>
					<button id="n-3" class="big">3</button>
					<button id="n-0" class="big">0</button>
					<button id="n-p" class="big">.</button>
					<button id="f-c" class="big">c</button>
				</div>
				<div class="right-side">
					<button id="f-d" class="small">&#247;</button>
					<button id="f-t" class="small">&#215;</button>
					<button id="f-m" class="small">&#45;</button>
					<button id="f-a" class="small">&#43;</button>
					<button id="f-e" class="small tall">&#61;</button>
				</div>
			</div>
		</div>
	</div>
 </html>
!

CSS 

              
                /* Welcome to Compass.
 * In this file you should write your main styles. (or centralize your imports)
 * Import this file using the following HTML or equivalent:
 * <link href="/stylesheets/screen.css" media="screen, projection" rel="stylesheet" type="text/css" /> */
/* line 17, ../../../../../../Library/Ruby/Gems/2.0.0/gems/compass-0.12.2/frameworks/compass/stylesheets/compass/reset/_utilities.scss */
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
  margin: 0;
  padding: 0;
  border: 0;
  font: inherit;
  font-size: 100%;
  vertical-align: baseline;
}

/* line 22, ../../../../../../Library/Ruby/Gems/2.0.0/gems/compass-0.12.2/frameworks/compass/stylesheets/compass/reset/_utilities.scss */
html {
  line-height: 1;
}

/* line 24, ../../../../../../Library/Ruby/Gems/2.0.0/gems/compass-0.12.2/frameworks/compass/stylesheets/compass/reset/_utilities.scss */
ol, ul {
  list-style: none;
}

/* line 26, ../../../../../../Library/Ruby/Gems/2.0.0/gems/compass-0.12.2/frameworks/compass/stylesheets/compass/reset/_utilities.scss */
table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* line 28, ../../../../../../Library/Ruby/Gems/2.0.0/gems/compass-0.12.2/frameworks/compass/stylesheets/compass/reset/_utilities.scss */
caption, th, td {
  text-align: left;
  font-weight: normal;
  vertical-align: middle;
}

/* line 30, ../../../../../../Library/Ruby/Gems/2.0.0/gems/compass-0.12.2/frameworks/compass/stylesheets/compass/reset/_utilities.scss */
q, blockquote {
  quotes: none;
}
/* line 103, ../../../../../../Library/Ruby/Gems/2.0.0/gems/compass-0.12.2/frameworks/compass/stylesheets/compass/reset/_utilities.scss */
q:before, q:after, blockquote:before, blockquote:after {
  content: "";
  content: none;
}

/* line 32, ../../../../../../Library/Ruby/Gems/2.0.0/gems/compass-0.12.2/frameworks/compass/stylesheets/compass/reset/_utilities.scss */
a img {
  border: none;
}

/* line 116, ../../../../../../Library/Ruby/Gems/2.0.0/gems/compass-0.12.2/frameworks/compass/stylesheets/compass/reset/_utilities.scss */
article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section, summary {
  display: block;
}

/* line 9, ../sass/screen.scss */
body {
  background-color: #545454;
  background-size: 13px 13px, 13px 13px;
  background-position: -2px -2px, -2px -2px;
  background-image: -moz-linear-gradient(#474747 1px, transparent 1px), -moz-linear-gradient(0, #474747 1px, transparent 1px);
  background-image: -webkit-linear-gradient(#474747 1px, transparent 1px), -webkit-linear-gradient(0, #474747 1px, transparent 1px);
  background-image: -ms-linear-gradient(#474747 1px, transparent 1px), -ms-linear-gradient(0, #474747 1px, transparent 1px);
}

/* line 17, ../sass/screen.scss */
div, button, span {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

/* line 21, ../sass/screen.scss */
.wrapper {
  width: 156px;
  height: 234px;
  position: relative;
  margin: 50px;
}
/* line 29, ../sass/screen.scss */
.wrapper .calc-body {
  width: 100%;
  height: 100%;
  padding: 6px;
  margin: 0;
  -webkit-border-radius: 10px;
  -moz-border-radius: 10px;
  -ms-border-radius: 10px;
  -o-border-radius: 10px;
  border-radius: 10px;
  -webkit-box-shadow: 0 3px 8px 0px rgba(0, 0, 0, 0.7);
  -moz-box-shadow: 0 3px 8px 0px rgba(0, 0, 0, 0.7);
  box-shadow: 0 3px 8px 0px rgba(0, 0, 0, 0.7);
  
  background-image: -webkit-linear-gradient(#fd823a, #fc6a27);
  background-image: -moz-linear-gradient(#fd823a, #fc6a27);
}
/* line 38, ../sass/screen.scss */
.wrapper .calc-body .readout {
  -webkit-box-shadow: inset 0 2px 3px 0px rgba(0, 0, 0, 0.3);
  -moz-box-shadow: inset 0 2px 3px 0px rgba(0, 0, 0, 0.3);
  box-shadow: inset 0 2px 3px 0px rgba(0, 0, 0, 0.3);
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  -ms-border-radius: 5px;
  -o-border-radius: 5px;
  border-radius: 5px;
  background-image: -webkit-linear-gradient(#b6dcf0, #b6dcf0 46%, #a2d3ee 46%, #acd8f0);
  background-image: -moz-linear-gradient(#b6dcf0, #b6dcf0 46%, #a2d3ee 46%, #acd8f0);
  width: 100%;
  height: 35px;
  margin-bottom: 6px;
  background-color: #a9d6f0;
}
/* line 47, ../sass/screen.scss */
.wrapper .calc-body .readout .value {
  font-family: Arial;
  color: #434343;
  padding: 10px;
  padding-top: 15px;
  display: block;
  width: 100%;
  height: 100%;
  text-align: right;
}
/* line 60, ../sass/screen.scss */
.wrapper .calc-body .buttons {
  width: 100%;
  height: 181px;
  background-image: -webkit-linear-gradient(#cacaca, #bbbbbb);
  background-image: -moz-linear-gradient(#cacaca, #bbbbbb);
  -webkit-box-shadow: inset 0 1px 1px 0px rgba(0, 0, 0, 0.3);
  -moz-box-shadow: inset 0 1px 1px 0px rgba(0, 0, 0, 0.3);
  box-shadow: inset 0 1px 1px 0px rgba(0, 0, 0, 0.3);
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  -ms-border-radius: 5px;
  -o-border-radius: 5px;
  border-radius: 5px;
}
/* line 68, ../sass/screen.scss */
.wrapper .calc-body .buttons .left-side {
  padding: 3px;
  width: 115px;
  float: left;
}
/* line 74, ../sass/screen.scss */
.wrapper .calc-body .buttons .right-side {
  padding: 3px;
  width: 29px;
  float: left;
}
/* line 79, ../sass/screen.scss */
.wrapper .calc-body .buttons .right-side button.small:not(:first-child) {
  margin-top: 6px;
}
/* line 85, ../sass/screen.scss */
.wrapper .calc-body .buttons button {
  -webkit-box-shadow: 0 1px 2px 0px rgba(0, 0, 0, 0.4);
  -moz-box-shadow: 0 1px 2px 0px rgba(0, 0, 0, 0.4);
  box-shadow: 0 1px 2px 0px rgba(0, 0, 0, 0.4);
  background-image: -webkit-linear-gradient(white, #e9e9e9);
  outline: none;
  text-align: center;
  border: 2px solid #fff;
  display: inline-block;
  font-family: Arial;
  font-weight: bold;
  color: #868686;
  -webkit-border-radius: 50% 50%;
  -moz-border-radius: 50% / 50%;
  border-radius: 50% / 50%;
}
/* line 98, ../sass/screen.scss */
.wrapper .calc-body .buttons button:active {
  background-image: -webkit-linear-gradient(#e9e9e9, white);
}
/* line 102, ../sass/screen.scss */
.wrapper .calc-body .buttons button.active {
  background-image: -webkit-linear-gradient(#fdb474, #fd9030);
  background-image: -moz-linear-gradient(#fdb474, #fd9030);
  color: white;
}
/* line 107, ../sass/screen.scss */
.wrapper .calc-body .buttons button.small {
  margin: 1px;
  width: 22px;
  height: 22px;
  font-size: 8px;
  padding: 0;
}
/* line 116, ../sass/screen.scss */
.wrapper .calc-body .buttons button.tall {
  height: 54px;
  -webkit-border-radius: 11px 11px;
  -moz-border-radius: 11px / 11px;
  border-radius: 11px / 11px;
}
/* line 121, ../sass/screen.scss */
.wrapper .calc-body .buttons button.big {
  width: 33px;
  height: 33px;
  margin-top: 4px;
  border: 3px solid #fff;
}
!

JS 

              
                (function(){

			var display = document.getElementById("output");
			
			var operatorFn = null;
			var RegA = 0;
			var RegB = 0;
			var resultMode = false;
			var screenText = "";
			var screenIsDecimal = false;
			var activeButton = null;

			var bp = document.getElementById("button-panel");
			bp.addEventListener("click", function(event){
				var target = event.target;
				if(target.tagName === "BUTTON"){
					
					var fn = target.getAttribute("id").split("-");

					if(fn[0] === "n"){
						number(fn[1]);
					} else {
						switch(fn[1]){
							case "c":
								reset(true);
							break;
							case "t":
							case "m":
							case "a":
							case "d":
								operate(fn[1], target);
							break;
							case "e":
								equals();
							break;
						}
					}


				}
			}, true);

			function buttonShowActive(button){

				// First deactivate any other button
				buttonsShowInactive();

				activeButton = button;
				addClass(button, "active");
			}

			function buttonsShowInactive(){
				if(activeButton){
					removeClass(activeButton, "active");
					activeButton = null;
				}
			}

			/**
			 * Adds a class to the given object
			 * @param {[type]} object [description]
			 * @param {[type]} cls    [description]
			 */
			function addClass(object, cls){
				object.className += " " + cls;
			}

			function removeClass(object, cls){
				object.className = object.className.replace(cls, "").replace(/\s+/g, ' ').trim();
			}

			function operate(method, button){
				console.log("operate");

				buttonShowActive(button);

				operatorFn = method;

				if(resultMode){
					console.log("Result mode");
					RegB = 0;
					dumpReg();
					resultMode = false;
				} else {
					if(!RegA){
						RegA = +screenText;
					} else  {
						RegB = +screenText;
						calculate();
					}
				}

				// Clear out the input
				screenText = "";
			}

			function output(value){
         value = "" + value;
				display.innerHTML = value.substring(0, 14);
			}

			function reset(zero){
				resultMode = false;
				screenIsDecimal = false;
				RegA = 0;
				RegB = 0;
				if (zero)
					screenText = "0";
				else
					screenText = "";
				operatorFn = null;
				buttonsShowInactive();
				output(screenText);
			}

			function number(n){

				if(resultMode){
					reset();
					console.log("resuilts");
				}

				buttonsShowInactive();

				if(n === "p"){
					if(!screenIsDecimal){
						screenIsDecimal = true;
						output(screenText += ".");
					}
				} else {
					if(+n != 0 && +screenText == 0 && screenText != ".")
						screenText = "";
					if(+n == 0 && +screenText == 0)
						screenText = "0";
					else
						screenText += n;
					output(screenText);
				}
			}

			function equals(){
				resultMode = true;
				RegB = +screenText;
				calculate();
			}

			function dumpReg(){
				console.log("RegA "+RegA);
				console.log("RegB "+RegB);
			}

			function calculate(){
				console.log("Calculating...");
				dumpReg();

				switch(operatorFn){
					case "t":
						RegA = RegA * RegB;
					break;
					case "m":
						RegA = RegA - RegB;
					break;
					case "d":
						RegA = RegA / RegB;
					break;
					case "a":
						RegA = RegA + RegB;
					break;
					// do nothing if we have no operator
					default:
					return;
					break;
				}
				dumpReg();
				output(RegA);
			}

		})();
!
999px

Console