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HTML

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CSS

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JavaScript

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Babel includes JSX processing.

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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);
}
!
999px

Console