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HTML

              
                #window(style="display:none;")
	.page.page-front
		.page-content
			.input-row
				label.label.fadeIn Username
				input.input.fadeIn.delay1#username(type="text" data-fyll="pineapple")
			.input-row
				label.label.fadeIn.delay2 Password
				input.input.fadeIn.delay3#password(type="password" data-fyll="hackmeplease")
			.input-row.perspective
				button.button.load-btn.fadeIn.delay4#submit
					span.default
						i.ion-arrow-right-b
						| Login
					.load-state
						.ball
						.ball
						.ball
	.page.page-back
		.page-content
			img.avatar(src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/22043/avatar.jpg")
			p.welcome Welcome back, Dog!
			.perspective
				button.button.inline.trigger-anim-replay
					i.ion-refresh
					| Replay animation
.browser-warning.hidden Glitchy or weird animation? Let it play through once, then press Replay.
              
            
!

CSS

              
                @import "compass/css3";

// Fonts
@import url(https://fonts.googleapis.com/css?family=Open+Sans:600,300,100);

// Mixins
@mixin keyframes($animationName) {
    @-webkit-keyframes $animationName {
        @content;
    }
    @-moz-keyframes $animationName {
        @content;
    }
    @keyframes $animationName {
        @content;
    }
}
@mixin animation($content) {
	-webkit-animation: $content;
	-moz-animation: $content;
	animation: $content;
}
@mixin animation-delay($content) {
    -webkit-animation-delay: $content;
    -moz-animation-delay: $content;
    animation-delay: $content;
}
@mixin animation-timing-function($content) {
    -webkit-animation-timing-function: $content;
    -moz-animation-timing-function: $content;
    animation-timing-function: $content;
}



// Variables
$global-radius: 3px;
$global-transition-duration: .2s;

$window-padding: 60px;
$window-anim-dur: 1.5s;

$global-overflow-timing-function: cubic-bezier(0.015, 0.695, 0.340, 1.365);

$color-pink: #D85C89;


// Basics
html, body {
	height: 100%;
}
body {
	@include background-image(radial-gradient(ellipse closest-side, #FFFFFF, #D4E2AF));
	@include perspective(1000px);
	font-family: 'Open Sans';
	font-weight: 300;
}


*, *::after, *::before {
	@include box-sizing(border-box);
}

// Animated window
#window {
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	margin: auto;
	height: 350px;
	width: 450px;
	color: #FFF;
	@include animation(#{$window-anim-dur} window ease-in-out backwards);
	@include transform-style(preserve-3d);
	@include transition-property(height width);

	&, .page, .page-content {
		@include transition-duration(1s);
	}

	&.flip {
		height: 460px;
		width: 350px;
		
		.page-front {
			@include transform(rotateX(180deg));
		}
		.page-back {
			@include transform(rotateX(360deg));

			.page-content {
				opacity: 1;
			}

			.avatar, .welcome, .perspective {
				opacity: 1;
				@include transform(none);
				@include transition-duration($global-transition-duration*3);
			}

			.avatar {
				@include transition-delay(.8s);
			}
			.welcome {
				@include transition-delay(.8s);
			}
			.perspective {
				@include transition-delay(.9s);
			}
		}
	}

	.page {
		position: absolute;
		top: 0;
		left: 0;
		right: 0;
		bottom: 0;
		overflow: hidden;

		@include transform-style(preserve-3d);
		@include backface-visibility(hidden);
		@include transform(translateZ(0)); // To enable backface-visibility

		background: #444; // IE support
		@include background-image(linear-gradient(bottom, #444, #333));
		@include border-radius($global-radius*2);
		padding: $window-padding;
	}
	.page-front {
		
	}
	.page-back {
		text-align: center;
		@include transform(rotateX(180deg));

		.page-content {
			opacity: 0;
		}

		.avatar {
			height: 150px;
			width: 150px;
			border: 5px solid #FFF;
			margin: 30px auto 40px auto;
			display: block;
			opacity: 0;
			@include transform(scale(.1));
			@include border-radius(1000px);
		}

		.welcome {
			font-size: 22px;
			margin-bottom: 40px;
		}

		.welcome, .perspective {
			opacity: 0;
			@include transform(translateY(-30px));
		}
	}

	.input-row {
		margin: 0 0 30px;

		&:last-of-type {
			margin-bottom: 0;
		}
	}

	.perspective {
		@include perspective(1000px);
	}

	.label {
		font-family: sans-serif;
		text-transform: uppercase;
		font-size: 12px;
		margin: 0 0 10px 0;
		color: #FFF;
		display: block;
		cursor: pointer;
	}

	.input {
		padding: 0 15px;
		height: 40px;
		line-height: 40px;
		outline: none;
		border: 0;
		background: #FFF;
		display: block;
		width: 100%;
		@include border-radius($global-radius);
		@include transition-duration($global-transition-duration);

		&:focus, &.fyll-focus {
			@include box-shadow(0 0 0 3px $color-pink);
		}
	}

	.button {
		height: 50px;
		line-height: 50px;
		padding:  0 20px;
		margin: 0;
		text-align: center;
		color: #FFF;
		border: 0;
		display: block;
		width: 100%;
		outline: none;
		cursor: pointer;
		overflow: hidden;
		font-size: 17px;
		background: #D85C89; // IE support
		@include border-radius($global-radius);
		@include background-image(linear-gradient(bottom, #D85C89, #E7779F));
		@include box-shadow(inset 0 1px 0 0 rgba(255,255,255,.4), 0 0 4px rgba(0,0,0,.5));
		@include transition-duration(.1s);
		@include transform-style(preserve-3d);
		@include transform-origin(bottom);
		@include transform(translateZ(0));
		@include backface-visibility(hidden);
	
		// Icon
		i {
			margin-right: 10px;
		}

		&:active, &.fyll-focus {
			background: #D85C89; // IE support
			@include background-image(linear-gradient(bottom, #D85C89, #D85C89));
			@include transform(rotateX(20deg));
		}

		&.inline {
			width: auto;
			display: inline-block;
		}

		&.load-btn {
			.default, .load-state {
				@include transition-duration($global-transition-duration);
			}
			.load-state {
				position: absolute;
				top: -50px;
				left: 0;
				right: 0;
				height: 100%;
				text-align: center;
				line-height: 50px;
				pointer-events: none;

				.ball {
					height: 10px;
					width: 10px;
					margin-right: 10px;
					background: #FFF;
					display: inline-block;
					@include border-radius(1000px);
					@include animation(ballBounce .3s alternate infinite);
					@include animation-timing-function(cubic-bezier(.2, .4, .3, 1));
					@include transition-duration(.3s);
	  
					&:nth-child(2n) {
						@include animation-delay(.05s);
					}
					&:nth-child(3n) {
						@include animation-delay(.1s);
					}


					&:last-child {
						margin-right: 0;
					}
				}
			}

			&.done {
				.ball {
					opacity: 0;
				}
			}

			&.loading {
				.default {
					@include transform(translateY(50px));
					opacity: 0;
				}
				.load-state {
					@include transform(translateY(50px));
				}
			}
		}
	}
}

.browser-warning {
	background: rgba(0, 0, 0, 0.7);
	padding: 15px 0;
	color: #FFF;
	position: absolute;
	top: 50px;
	left: 0;
	right: 0;
	margin: auto;
	width: 530px;
	text-align: center;
	@include border-radius($global-radius);
	@include transition-duration(.5s);
	@include transition-timing-function($global-overflow-timing-function);

	&.hidden {
		opacity: 0;
		@include transform(scale(0.2));
	}
}



.fadeIn {
	@include animation(1s fadeIn $global-overflow-timing-function backwards);
	@include animation-delay($window-anim-dur);
}
.delay1 {
	@include animation-delay(($window-anim-dur + .1s));
}
.delay2 {
	@include animation-delay(($window-anim-dur + .2s));
}
.delay3 {
	@include animation-delay(($window-anim-dur + .3s));
}
.delay4 {
	@include animation-delay(($window-anim-dur + .4s));
}


@include keyframes(window) {
	0% {
		@include transform(scale(0) rotateX(360deg));
		height: 150px;
		width: 150px;
	}
	50% {
		@include transform(none);
		height: 150px;
	}
	75% {
		height: 350px;
		width: 150px;
	}
	100% {
		width: 450px;
	}
}

@include keyframes(fadeIn) {
	0% {
		opacity: 0;
		@include transform(translateY(30px));
	}
	100% {
		opacity: 1;
		@include transform(none);
	}
}
@include keyframes(ballBounce) {
  0% {
    @include transform(translateY(25%));
  }
  100% {
    @include transform(translateY(-75%));
  }
}
              
            
!

JS

              
                jQuery(document).ready(function($) {

	// If firefox
	if(navigator.userAgent.toLowerCase().match(/firefox/)) {
		$('.browser-warning').removeClass('hidden');
		setTimeout(function() {
			$('.browser-warning').addClass('hidden');
		}, 6*1000);
	}

	// Display window (and start animation) when document is ready
	// This mininizes the risk of firefox messing up
	$('#window').attr('style', '');

	initAnimation();
	$(document).on('click', '.trigger-anim-replay', resetAnimation);

	function initAnimation() {
		setTimeout(function() {
			fyll.go('fill username then fill password then click submit', function() {
				$('#submit').addClass('loading');
				setTimeout(function() {
					$('#submit').addClass('done').closest('#window').addClass('flip');
				}, 1500);
			});
		}, 3*1000);
	}

	function resetAnimation() {
		var win = $('#window');

		win.stop().fadeOut(500, function() {

			// Reset things
			win.attr('style', '');
			win.find('input[type=text], input[type=password]').val('');
			win.find('.load-btn.loading').removeClass('loading done');

			// Clone and re-create window element to trigger animation restart
			win.removeClass('flip');
			win.before(win.clone(true)).remove();

			// Restart animation
			initAnimation();
		});
	}

});
              
            
!
999px

Console