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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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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>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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CSS

About CSS Preprocessors

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.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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

Add External Stylesheets/Pens

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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About External Resources

You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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HTML Settings

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HTML 

            
              h1 Made with <b>love</b> by <b>Orzoon</b>
p Use buttons to <strong>Open</strong> and <strong>Close</strong> the envelope
.all_container
 .container
  .envelope
  .flip
  .letter
    .text
 button#open open
 br
 button#close close
 hr
!

CSS 

            
              body{
	background: linear-gradient(to right,#666666,#ecedfd);
	//background: #fff;
}
//shortcuts
$s: solid;
$a: absolute;
$tb:46px;
$lr:70px;
$br:6px;
//color variables
$left:#fa565a;
$right:#ed4c50;
$bottom:#fa565a;
$txt: #b0b0b0;
$top: #c94548;

.container,.envelope,.flip,.letter,.text,.text:before,.text:after{
	position: $a;
}
.container{
	position:relative;
	top:80px;
	margin:auto;
	height: 92px;
	width: 140px;
	background: #ddd;
	border-radius: $br;
	box-shadow: 0px 0px 3px #000;
  }
.envelope{
	border-top: $tb $s transparent;
	border-left: $lr $s $left;
	border-bottom: $tb $s $bottom;
	border-right: $lr $s $right;
	border-radius: $br;
	z-index:9;
  }
.flip{
	top:0;
	left:0;
	border-top: $tb $s $top;
	border-left: $lr $s transparent;
	border-bottom: $tb $s transparent;
	border-right: $lr $s transparent;
	border-radius: $br;
	z-index:6;
  }
.letter{
	top:0px;
	left:2px;
	height: 92px;
	width: 136px;
	background: #ddd;
	border-radius: $br;
	z-index:5;
	}
.text{
	top: 10px;
	left:12px;
	height:6px;
	width:100px;
	background: $txt;
  }
.text:before,.text:after{
	content:'';
	height:100%;
	background: $txt;
	left:0px;
	}
.text:before{
	top:10px;
	width: 50px;
	}
.text:after{
	top:20px;
	width:65px;
  }
/*Classes to be Added and removed*/
.open{
	animation: flipOpen .4s ease-in forwards ;
 }

.close{
	animation: flipClose .4s ease-in forwards;
 }

.letterOpen{
	top:-40px;
	transition: .3s ease-in;
 }

.letterClose{
	top: 0px;
	transition: .3s ease-in;
 }
//animations
@keyframes flipOpen{
	0%{
		transform: rotateX(0deg);
		transform-origin:center top;
	  }
	100%{
		transform:rotateX(180deg);
		transform-origin:center top;
	  }
  }
@keyframes flipClose{
	0%{
		transform: rotateX(180deg);
		transform-origin:center top;
	  }
	100%{
		transform:rotateX(0deg);
		transform-origin:center top;
	  }
  }
//buttons
button{
	color:#ddd;
	font-size:18px;
	font-weight: 600;
	text-transform: uppercase;
	width:100px;
	text-align:center;
	padding:10px;
	border-radius: 6px;
	border:none;
	letter-spacing: 1px;
	background: $right;
}
button:hover{
	cursor:pointer;
}
button:focus{
	outline: none;
	background: #ccc;
	color: #666;
	cursor: not-allowed;
}
#open{
	margin-top:-10px;
	margin-bottom: 8px;
}
#close{
	outline: none;
	background: #ccc;
	color: #ddd;
	cursor: not-allowed;
}
#open:focus ~ #close{
	cursor: pointer;
	background:$right;
}
//heaing
h1{
	font-size:25px;
	width: 400px;
	margin:0 auto;
	text-align:center;
	border-bottom: 3px solid #000;
	padding-bottom:10px;
	padding-top: 10px;
	}
p{
	font-size: 20px;
	font-weight: 400;
	text-align:center;
}
b:first-child{
	color:#E31B23;
	text-shadow: 0 0 3px #000;
}
b:last-child{
	color:blue;
	text-shadow: 0 0 2px #000;
}
hr{
width: 300px;
margin: 100px auto;
height: 4px;
background-color:#666;
border: 0px;
}
!

JS 

            
              //variables
let flip = document.querySelector('.flip');
let letter = document.querySelector('.letter');
let btnOpen = document.querySelector('#open');
let btnClose = document.querySelector('#close');

//EventListner
btnOpen.addEventListener('click', open);
btnClose.addEventListener('click', close);

//open
function open(){
	flip.classList.add('open');
	flip.classList.remove('close');
	setTimeout(function(){
	letter.classList.add('letterOpen');
	letter.classList.remove('letterClose');
	letter.style.zIndex = '7';
	},400);
}

//close
function close(){
	letter.classList.remove('letterOpen');
	letter.classList.add('letterClose');
	setTimeout(function(){
		flip.classList.remove('open');
		flip.classList.add('close');
		letter.style.zIndex = '5';
	},300);
}
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999px

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