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CSS

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HTML 

              
                <section class="section">
	<h1>So you think you can create an ID?</h1>

	<div class="form-progress">
		<progress class="form-progress-bar" min="0" max="100" value="0" step="33" aria-labelledby="form-progress-completion"></progress>
		
		<div class="form-progress-indicator one active"></div>
		<div class="form-progress-indicator two"></div>
		<div class="form-progress-indicator three"></div>
		<div class="form-progress-indicator four"></div>
		
		<p id="form-progress-completion" class="js-form-progress-completion sr-only" aria-live="polite">0% complete</p>
	</div>
	
	
	<div class="animation-container">
		<!-- Step one -->
		<div class="form-step js-form-step" data-step="1">

			<p class="form-instructions"><strong>Click the continue button to show form progression.</strong><br>
				Please fill out the fields below so we can learn some information about you. We promise to store these on Post-It<sup><small>TM</small></sup> notes around the office.</p>

			<form action="" name="form-step-1">
				<div class="fieldgroup">
					<input type="text" name="firstName" id="firstName" />
					<label for="firstName">First name</label>
				</div>

				<div class="fieldgroup">
					<input type="text" name="lastName" id="lastName" />
					<label for="lastName">Last name</label>
				</div>

				<div class="fieldgroup">
					<input type="text" name="email" id="email" />
					<label for="email">Email</label>
				</div>

				<div class="fieldgroup">
					<input type="text" name="postalCode" id="postalCode" />
					<label for="postalCode">Postal code</label>
				</div>

				<div class="buttons">
							<button type="button" class="btn btn-alt js-reset">Reset</button>

						<button type="submit" class="btn">Continue</button>
				</div>
			</form>

		</div>
		
			<!-- Step two -->
			<div class="form-step js-form-step waiting hidden" data-step="2">

				<p class="form-instructions"><strong>Click the continue button to show form progression.</strong>
						<br> Please fill in the token below with yesterday's date plus the timestamp from the day of your birth (expressed as an integer) to the power of fourteen divided by two.</p>

				<form action="" name="form-step-2">
						<div class="fieldgroup">
								<input type="text" name="token" id="token" />
								<label for="token">Token</label>
						</div>

						<div class="buttons">
								<button type="button" class="btn btn-alt js-reset">Reset</button>

								<button type="submit" class="btn">Continue</button>
						</div>
				</form>

		</div>
		
		
		
					<!-- Step three -->
			<div class="form-step js-form-step waiting hidden" data-step="3">

				<p class="form-instructions"><strong>Click the continue button to show form progression.</strong>
						<br> Please tell us your credit card information. We promise not to store it or use it to buy a new iPhone in the App Store.</p>

				<form action="" name="form-step-3">
						<div class="fieldgroup">
								<input type="text" name="credit-card" id="credit-card" />
								<label for="credit-card">Credit card number</label>
						</div>
					
						<div class="fieldgroup">
								<input type="text" name="credit-card-expiry" id="credit-card-expiry" />
								<label for="credit-card-expiry">Credit card expiry</label>
						</div>

						<div class="buttons">
								<button type="button" class="btn btn-alt js-reset">Reset</button>

								<button type="submit" class="btn">Continue</button>
						</div>
				</form>

		</div>
		
		
		
		<!-- Step four -->
			<div class="form-step js-form-step waiting hidden" data-step="4">

				<p class="form-instructions"><strong>Click the continue button to show form progression.</strong>
						<br> Finally, please just write the words "I Agree" in the field below to consent to us using the previous data you entered to buy a new iPhone.</p>

				<form action="" name="form-step-4">
						<div class="fieldgroup">
								<input type="text" name="agreen" id="agreen" />
								<label for="agreen">I agree</label>
						</div>

						<div class="buttons">
								<button type="button" class="btn btn-alt js-reset">Reset</button>
						</div>
				</form>

		</div>
	</div>
</section>
!

CSS 

              
                $green: rgb(11,204,108);
$page-animDuration: .2s;

// =============================
// Universal styles
// =============================
body {
	background: rgba(0,0,0,.1);
	line-height: 1.45rem;
	color: #444;
	
	&.freeze { pointer-events: none; }
} 

h1 {
	margin: 0;
	margin-bottom: 2rem;
	text-align: center;
	font-weight: normal;
	line-height: 2.2rem;
}

// =============================
// Form styles
// =============================
.section {
	max-width: 500px;
	padding: 4rem;
	margin: 5vh auto 0 auto;
	background: white;
	box-shadow: 0 1px 2px rgba(0,0,0,.3);
	
	&:before {
		content: "";
		width: 100%;
		background: lighten($green, 5%);
		height: 170px;
		position: absolute;
		top: 0;
		left: 0;
		z-index: -1;
		border-bottom: 1px solid rgba(0,0,0,.2);
	}
}

.form-instructions {
	text-align: center;
}

form {
	margin: 2rem auto;
	width: 100%;	
	max-width: 330px;	
	will-change: transform;
}

// =============================
// Input styles
// =============================
.fieldgroup {
	margin: 1.5rem 0;
	position: relative;
}

label {
	position: absolute;
	top: .8rem;	
	left: 0;
	display: block;
	font-size: 1rem;
	transition: $page-animDuration ease-out;	
	opacity: .5;
	will-change: top, font-size;
	
	&:hover {
		cursor: text;
	}	
}

input {
	border: 1px solid #fff;
	font-size: 1.2rem;
	padding: .6rem;
	padding-left: 0;
	background:transparent;
	border: none;
	border-bottom: 2px solid #444;
	transition: $page-animDuration;
	width: calc(100% - .6rem);
	max-width: 350px;
	border-radius: 0;
	
	&:focus {
		outline: none;
	}
	
	&:valid {
		border-color: #444;
	}
	
	&:focus + label,
	&.hasInput + label {
		top: -.8rem;
		font-size: .7rem;
	}
}

// =============================
// Buttons
// =============================
.btn {
	color: #fff;
	background-color: $green;
	padding: .8rem;
	font-size: 1.2rem;
	line-height: 1.2rem;
	border-radius: 5px;
	border: 2px solid transparent;
	min-width: 45px !important;

	&:hover,
	&.hover {
		color: #fff;

		text-shadow: 0 1px 3px rgba(0,0,0,.3);
		transition: .2s;
	}

	&:active,
	&.active {
		color: #fff;
		background-color: darken($green, 20%);
		box-shadow: inset 0 2px 10px rgba(0,0,0,.3);
		outline: 2px solid $green;
	}

	&:focus,
	&.focus {
		color: #fff;
		outline: 2px solid $green;
		outline-offset: 2px;
	}

	&:active:focus,
	&.active.focus {
		outline: 4px solid $green;
	}

	//Reset outlines on button with frozen states
	&.hover,
	&.active { outline: none; }
}

//Alternate action
.btn-alt {
	background-color: transparent;
	color: $green;
	border: 2px solid $green;

	&:hover,
	&.hover {
		background-color: transparent;
		color: darken($green, 40%);
		border-color: darken($green, 40%);
		text-shadow: none;
	}

	&:focus,
	&.focus {
		color: darken($green, 20%);
	}

	&:active,
	&.active {
		color: #fff;
		background-color: $green;
		text-shadow: 0 -1px 0 rgba(255,255,255,.2);
	}

	//Reset outlines on button with frozen states
	&.hover,
	&.active { outline: none; }
}

.buttons { 
	display: flex;
	
	.btn { margin-right: 15px; }
}

form .btn {
	display: inline-block;
	width: 100%;	
	max-width: 220px;
	margin: 4rem auto 0 auto;
}

[data-step="4"] button.btn {
	display: block;
	margin: 0 auto;
}

// =============================
// Progress bar
// =============================
.form-progress {
	position: relative;
	display: block;
	margin: 3rem auto;
	width: 100%;
	max-width: 400px;
}

progress { 
	display: block;
	position: relative;
	top: 5px;
	left: 5px;
	-webkit-appearance: none;
	appearance: none;
	background: $green;
	width: 100%;
	height: 5px;
	background: none;
	transition: 1s;
	will-change: contents;
	
	&::-webkit-progress-bar {
		background-color: #ddd;
	}
	
 &::-webkit-progress-value {
		background-color: $green;
		transition: all 0.5s ease-in-out;
	}
}

.form-progress-indicator {
	position: absolute;
	top: -6px;
	left: 0;
	display: inline-block;
	width: 20px;
	height: 20px;
	background: white;
	border: 3px solid #ddd;
	border-radius: 50%;
	transition: all .2s ease-in-out;
	transition-delay: .3s;
	will-change: transform;
	
	&.one		{ left: 0; }
	&.two 	{ left: 33%; }
	&.three { left: 66%; }	
	&.four 	{ left: 100%; }	
	
	&.active {
		animation: bounce .5s forwards;
		animation-delay: .5s;
		border-color: $green;
	}
}

// =============================
// Form animations
// =============================
.animation-container {
	position: relative;
	width: 100%;
	transition: .3s;
	will-change: padding;
	overflow: hidden;
}

.form-step {
	position: absolute;
	transition: 1s ease-in-out;
	transition-timing-function: ease-in-out;
	will-change: transform, opacity;
}

.form-step.leaving {
	animation: left-and-out .5s forwards;
}

.form-step.waiting {
	transform: translateX(400px);
}

.form-step.coming {
	animation: right-and-in .5s forwards;
}

// =============================
// Animation definitions
// =============================
@keyframes left-and-out {
	100% {
		opacity: 0;
		transform: translateX(-400px);
	}
}

@keyframes right-and-in {
	100% {
		opacity: 1;
		transform: translateX(0);
	}
}

@keyframes bounce {
	50% {
		transform: scale(1.5);
	}
	100% {
		transform: scale(1);
	}
}

// =============================
// Helpers
// =============================
.sr-only {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0,0,0,0);
	border: 0;
}

.hidden {
	display: none;
}
!

JS 

              
                var $body = $('body');
var $progressBar = $('progress');
var $animContainer = $('.animation-container');
var value = 0;
var transitionEnd = 'webkitTransitionEnd transitionend';

/**
 * Resets the form back to the default state.
 * ==========================================
 */
function formReset() {
	value = 0;
	$progressBar.val(value);
	$('form input').not('button').val('').removeClass('hasInput');
	$('.js-form-step').removeClass('left leaving');
	$('.js-form-step').not('.js-form-step[data-step="1"]').addClass('hidden waiting');
	$('.js-form-step[data-step="1"]').removeClass('hidden');
	$('.form-progress-indicator').not('.one').removeClass('active');
	
	$animContainer.css({
		'paddingBottom': $('.js-form-step[data-step="1"]').height() + 'px'
	});
	
	console.warn('Form reset.');
	return false;
}

/**
 * Sets up the click handlers on the form. Next/reset.
 * ===================================================
 */
function setupClickHandlers() {

	// Show next form on continue click
	$('button[type="submit"]').on('click', function(event) {
			event.preventDefault();
			var $currentForm = $(this).parents('.js-form-step');
			showNextForm($currentForm);
	});

	// Reset form on reset button click
	$('.js-reset').on('click', function() {
		formReset();
	});
	
	return false;
}

/**
 * Shows the next form.
 * @param - Node - The current form.
 * ======================================
 */
function showNextForm($currentForm) {
	var currentFormStep = parseInt($currentForm.attr('data-step')) || false;
	var $nextForm = $('.js-form-step[data-step="' + (currentFormStep + 1) + '"]');

	console.log('Current step is ' + currentFormStep);
	console.log('The next form is # ' + $nextForm.attr('data-step'));

	$body.addClass('freeze');

	// Ensure top of form is in view
	$('html, body').animate({
		scrollTop : $progressBar.offset().top
	}, 'fast');

	// Hide current form fields
	$currentForm.addClass('leaving');
	setTimeout(function() {
		$currentForm.addClass('hidden');
	}, 500);
	
	// Animate container to height of form
	$animContainer.css({
		'paddingBottom' : $nextForm.height() + 'px'
	});  

	// Show next form fields
	$nextForm.removeClass('hidden')
					 .addClass('coming')
					 .one(transitionEnd, function() {
						 $nextForm.removeClass('coming waiting');
					 });

	// Increment value (based on 4 steps 0 - 100)
	value += 33;

	// Reset if we've reached the end
	if (value >= 100) {
		formReset();
	} else {
		$('.form-progress')
			.find('.form-progress-indicator.active')
			.next('.form-progress-indicator')
			.addClass('active');

		// Set progress bar to the next value
		$progressBar.val(value);
	}

	// Update hidden progress descriptor (for a11y)
	$('.js-form-progress-completion').html($progressBar.val() + '% complete');

	$body.removeClass('freeze');

	return false;
}

/**
 * Sets up and handles the float labels on the inputs.
 =====================================================
 */
function setupFloatLabels() {
	// Check the inputs to see if we should keep the label floating or not
	$('form input').not('button').on('blur', function() {

		// Different validation for different inputs
		switch (this.tagName) {
			case 'SELECT':
				if (this.value > 0) {
					this.className = 'hasInput';
				} else {
					this.className = '';
				}
				break;

			case 'INPUT':
				if (this.value !== '') {
					this.className = 'hasInput';
				} else {
					this.className = '';
				}
				break;

			default:
				break;
		}
	});
	
	return false;
}

/**
 * Gets the party started.
 * =======================
 */
function init() {
	formReset();
	setupFloatLabels();
	setupClickHandlers();
}

init();
!
999px

Console