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HTML

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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 Base

About CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                
	<a href="https://front.codes/" class="logo" target="_blank">
		<img src="https://assets.codepen.io/1462889/fcy.png" alt="">
	</a>

	<div class="section">
		<div class="container">
			<div class="row full-height justify-content-center">
				<div class="col-12 text-center align-self-center py-5">
					<div class="section pb-5 pt-5 pt-sm-2 text-center">
						<h6 class="mb-0 pb-3"><span>Log In </span><span>Sign Up</span></h6>
			          	<input class="checkbox" type="checkbox" id="reg-log" name="reg-log"/>
			          	<label for="reg-log"></label>
						<div class="card-3d-wrap mx-auto">
							<div class="card-3d-wrapper">
								<div class="card-front">
									<div class="center-wrap">
										<div class="section text-center">
											<h4 class="mb-4 pb-3">Log In</h4>
											<div class="form-group">
												<input type="email" name="logemail" class="form-style" placeholder="Your Email" id="logemail" autocomplete="off">
												<i class="input-icon uil uil-at"></i>
											</div>	
											<div class="form-group mt-2">
												<input type="password" name="logpass" class="form-style" placeholder="Your Password" id="logpass" autocomplete="off">
												<i class="input-icon uil uil-lock-alt"></i>
											</div>
											<a href="#" class="btn mt-4">submit</a>
                            				<p class="mb-0 mt-4 text-center"><a href="#0" class="link">Forgot your password?</a></p>
				      					</div>
			      					</div>
			      				</div>
								<div class="card-back">
									<div class="center-wrap">
										<div class="section text-center">
											<h4 class="mb-4 pb-3">Sign Up</h4>
											<div class="form-group">
												<input type="text" name="logname" class="form-style" placeholder="Your Full Name" id="logname" autocomplete="off">
												<i class="input-icon uil uil-user"></i>
											</div>	
											<div class="form-group mt-2">
												<input type="email" name="logemail" class="form-style" placeholder="Your Email" id="logemail" autocomplete="off">
												<i class="input-icon uil uil-at"></i>
											</div>	
											<div class="form-group mt-2">
												<input type="password" name="logpass" class="form-style" placeholder="Your Password" id="logpass" autocomplete="off">
												<i class="input-icon uil uil-lock-alt"></i>
											</div>
											<a href="#" class="btn mt-4">submit</a>
				      					</div>
			      					</div>
			      				</div>
			      			</div>
			      		</div>
			      	</div>
		      	</div>
	      	</div>
	    </div>
	</div>
!

CSS 

              
                

/* Please ❤ this if you like it! */


@import url('https://fonts.googleapis.com/css?family=Poppins:400,500,600,700,800,900');

body{
	font-family: 'Poppins', sans-serif;
	font-weight: 300;
	font-size: 15px;
	line-height: 1.7;
	color: #c4c3ca;
	background-color: #1f2029;
	overflow-x: hidden;
}
a {
	cursor: pointer;
  transition: all 200ms linear;
}
a:hover {
	text-decoration: none;
}
.link {
  color: #c4c3ca;
}
.link:hover {
  color: #ffeba7;
}
p {
  font-weight: 500;
  font-size: 14px;
  line-height: 1.7;
}
h4 {
  font-weight: 600;
}
h6 span{
  padding: 0 20px;
  text-transform: uppercase;
  font-weight: 700;
}
.section{
  position: relative;
  width: 100%;
  display: block;
}
.full-height{
  min-height: 100vh;
}
[type="checkbox"]:checked,
[type="checkbox"]:not(:checked){
  position: absolute;
  left: -9999px;
}
.checkbox:checked + label,
.checkbox:not(:checked) + label{
  position: relative;
  display: block;
  text-align: center;
  width: 60px;
  height: 16px;
  border-radius: 8px;
  padding: 0;
  margin: 10px auto;
  cursor: pointer;
  background-color: #ffeba7;
}
.checkbox:checked + label:before,
.checkbox:not(:checked) + label:before{
  position: absolute;
  display: block;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: #ffeba7;
  background-color: #102770;
  font-family: 'unicons';
  content: '\eb4f';
  z-index: 20;
  top: -10px;
  left: -10px;
  line-height: 36px;
  text-align: center;
  font-size: 24px;
  transition: all 0.5s ease;
}
.checkbox:checked + label:before {
  transform: translateX(44px) rotate(-270deg);
}


.card-3d-wrap {
  position: relative;
  width: 440px;
  max-width: 100%;
  height: 400px;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
  perspective: 800px;
  margin-top: 60px;
}
.card-3d-wrapper {
  width: 100%;
  height: 100%;
  position:absolute;    
  top: 0;
  left: 0;  
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
  transition: all 600ms ease-out; 
}
.card-front, .card-back {
  width: 100%;
  height: 100%;
  background-color: #2a2b38;
  background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/1462889/pat.svg');
  background-position: bottom center;
  background-repeat: no-repeat;
  background-size: 300%;
  position: absolute;
  border-radius: 6px;
  left: 0;
  top: 0;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
  -webkit-backface-visibility: hidden;
  -moz-backface-visibility: hidden;
  -o-backface-visibility: hidden;
  backface-visibility: hidden;
}
.card-back {
  transform: rotateY(180deg);
}
.checkbox:checked ~ .card-3d-wrap .card-3d-wrapper {
  transform: rotateY(180deg);
}
.center-wrap{
  position: absolute;
  width: 100%;
  padding: 0 35px;
  top: 50%;
  left: 0;
  transform: translate3d(0, -50%, 35px) perspective(100px);
  z-index: 20;
  display: block;
}


.form-group{ 
  position: relative;
  display: block;
    margin: 0;
    padding: 0;
}
.form-style {
  padding: 13px 20px;
  padding-left: 55px;
  height: 48px;
  width: 100%;
  font-weight: 500;
  border-radius: 4px;
  font-size: 14px;
  line-height: 22px;
  letter-spacing: 0.5px;
  outline: none;
  color: #c4c3ca;
  background-color: #1f2029;
  border: none;
  -webkit-transition: all 200ms linear;
  transition: all 200ms linear;
  box-shadow: 0 4px 8px 0 rgba(21,21,21,.2);
}
.form-style:focus,
.form-style:active {
  border: none;
  outline: none;
  box-shadow: 0 4px 8px 0 rgba(21,21,21,.2);
}
.input-icon {
  position: absolute;
  top: 0;
  left: 18px;
  height: 48px;
  font-size: 24px;
  line-height: 48px;
  text-align: left;
  color: #ffeba7;
  -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}

.form-group input:-ms-input-placeholder  {
  color: #c4c3ca;
  opacity: 0.7;
  -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}
.form-group input::-moz-placeholder  {
  color: #c4c3ca;
  opacity: 0.7;
  -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}
.form-group input:-moz-placeholder  {
  color: #c4c3ca;
  opacity: 0.7;
  -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}
.form-group input::-webkit-input-placeholder  {
  color: #c4c3ca;
  opacity: 0.7;
  -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}
.form-group input:focus:-ms-input-placeholder  {
  opacity: 0;
  -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}
.form-group input:focus::-moz-placeholder  {
  opacity: 0;
  -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}
.form-group input:focus:-moz-placeholder  {
  opacity: 0;
  -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}
.form-group input:focus::-webkit-input-placeholder  {
  opacity: 0;
  -webkit-transition: all 200ms linear;
    transition: all 200ms linear;
}

.btn{  
  border-radius: 4px;
  height: 44px;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  -webkit-transition : all 200ms linear;
  transition: all 200ms linear;
  padding: 0 30px;
  letter-spacing: 1px;
  display: -webkit-inline-flex;
  display: -ms-inline-flexbox;
  display: inline-flex;
  -webkit-align-items: center;
  -moz-align-items: center;
  -ms-align-items: center;
  align-items: center;
  -webkit-justify-content: center;
  -moz-justify-content: center;
  -ms-justify-content: center;
  justify-content: center;
  -ms-flex-pack: center;
  text-align: center;
  border: none;
  background-color: #ffeba7;
  color: #102770;
  box-shadow: 0 8px 24px 0 rgba(255,235,167,.2);
}
.btn:active,
.btn:focus{  
  background-color: #102770;
  color: #ffeba7;
  box-shadow: 0 8px 24px 0 rgba(16,39,112,.2);
}
.btn:hover{  
  background-color: #102770;
  color: #ffeba7;
  box-shadow: 0 8px 24px 0 rgba(16,39,112,.2);
}




.logo {
	position: absolute;
	top: 30px;
	right: 30px;
	display: block;
	z-index: 100;
	transition: all 250ms linear;
}
.logo img {
	height: 26px;
	width: auto;
	display: block;
}
!

JS 

              
                /* ========================================= * 
		        BEST VIEWED FULLSCREEN
   https://codepen.io/ig_design/full/KKVQpVP
 * ========================================= */
!
999px

Console