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CSS

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HTML 

              
                .clock-wrapper
	.bg
	.knob
	.knob-lines#knob-lines
		- (0..14).each do |i|
			.knob-line
	.btn#ampm
	.btn.radio-btn#radio-btn
		%span radio
	.logo Ika
	.minutes
		.dizaines
			- (0..5).each do |i|
				.number{:id => "minutes-dizaines-#{i}"} 
					.up
						.digit #{i}
					.down
						.digit #{i}
		.unites
			- (0..9).each do |i|
				.number{:id => "minutes-unites-#{i}"} 
					.up
						.digit #{i}
					.down
						.digit #{i}
	.hours
		.dizaines
			- (0..1).each do |i|
				.number{:id => "hours-dizaines-#{i}"} 
					.up
						.digit #{i}
					.down
						.digit #{i}
		.unites
			- (0..9).each do |i|
				.number{:id => "hours-unites-#{i}"} 
					.up
						.digit #{i}
					.down
						.digit #{i}
	.seconds-wrapper
		#seconds.seconds
			- (0..59).each do |i|
				.second #{i}
!

CSS 

              
                $colors-beige: (
	100: #eeead1,
	200: #eadfb5,
	300: #c4baaf
);

$colors-green: (
	100: #10ffa6,
	200: #6fd1b5,
	300: #6ac5a9
);

$colors-purple: (
	100: #6e4875,
	200: #472c4b
);

$colors-yellow: (
	100: #fdb800
);

$colors-red: (
	100: #f85302
);

$colors-blue: (
	100: #00f1ff
);

body {
	background: map-get($colors-green, 200);
	font-family: 'ATC Duel';
	text-align: center;
}

.minutes,
.hours,
.unites,
.dizaines,
.number,
.logo,
.btn,
.seconds-wrapper,
.seconds,
.second,
.seconds-wrapper:before,
.clock-wrapper:before,
.clock-wrapper:after,
.up,
.down,
.digit,
.knob,
.knob-lines,
.hours:before,
.bg { position: absolute; }

.clock-wrapper {
	position: relative;
	z-index: 1;
	
	display: inline-block;
	margin: 33.5vmin 8.5vmin;
	width: 83vmin;
	height: 26.5vmin;
	
	&:before {
		right: 5vmin;
		bottom: -4vmin;
		left: 5vmin;
		
		display: block;
		height: 4vmin;
		
		background: map-get($colors-beige, 200);
		border-top: 1vmin solid map-get($colors-green, 300);
		
		content: '';
		
		transform: perspective(200px) rotateX(10deg);    
	}
	
	&:after {
		bottom: -4vmin;
		z-index: -1;
		
		display: block;
		width: 100%;
		height: 100%;
		
		background: map-get($colors-green, 300);
		border-radius: 1vmin;
		
		content: '';
		
		transform: perspective(100vmin) rotateX(60deg) skew(60deg);
		transform-origin: bottom right;
	}
	
	.bg {
		width: 100%;
		height: 100%;
		
		background: map-get($colors-beige, 100);
		border-radius: 1vmin;
	}
}

.seconds-wrapper {
	top: 5vmin;
	right: 16vmin;
	bottom: 5vmin;
	
	width: 8vmin;
	overflow: hidden;
	
	background: map-get($colors-purple, 200);
	border-radius: 0.5vmin;
	
	&:before {
		top: 50%;
		left: 0;
		z-index: 1;
		
		display: block;
		border: 1vmin solid transparent;
		border-right-width: 3.66vmin;
		border-left: 3.66vmin solid map-get($colors-red, 100);
		
		content: '';
		
		transform: translateY(-50%);
	}
}

.seconds {
	top: 50%;
	margin-top: 1.3vmin;
	
	transform-style: preserve-3d;
	backface-visibility: hidden;
	
	animation: secondsTick 60s infinite linear;
	animation-play-state: paused;
}


@-webkit-keyframes secondsTick {
	0% { -webkit-transform: rotateX(0deg); }
	100% { -webkit-transform: rotateX(-360deg); }
}

@-moz-keyframes secondsTick {
	0% { -moz-transform: rotateX(0deg); }
	100% { -moz-transform: rotateX(-360deg); }
}

@-ms-keyframes secondsTick {
	0% { -ms-transform: rotateX(0deg); }
	100% { -ms-transform: rotateX(-360deg); }
}

@keyframes secondsTick {
	0% { transform: rotateX(0deg); }
	100% { transform: rotateX(-360deg); }
}

.second {
	font-size: 1.5vmin;
	color: map-get($colors-yellow, 100);
	text-align: center;
	white-space: nowrap;
	line-height: 2.6vmin;
	letter-spacing: 0.05em;
	
	backface-visibility: hidden;
	
	&:before {
		display: inline-block;
		margin: -0.3vmin 1.3vmin 0 1vmin;
		width: 2.6vmin;
		height: 0.26vmin;
		
		background: currentColor;
		
		content: '';
		vertical-align: middle;
	}
	
	@for $i from 1 to 61 {
		&:nth-child(#{$i}) {
			transform: rotateX(#{$i * 6}deg) translateZ(24.737347581vmin);
		}
	}
}

.btn {
	top: 12.5vmin;
	right: 5vmin;
	
	padding: 1.3vmin 0 1.1vmin;
	width: 6.5vmin;
	
	background: currentColor;
	box-shadow:
		inset 0 0 3vmin rgba(black, 0.2),
		0 0 6vmin rgba(lighten(map-get($colors-green, 100), 20%), 0.75);
	
	color: map-get($colors-green, 100);
	line-height: 1;
	font-family: 'ATC Timberline';
	font-size: 1vmin;
	text-transform: uppercase;
	text-align: center;

	span {
		color: white;
		transition: color 0.3s;
	}	
}

.radio-btn {
	top: auto;
	bottom: 5vmin;
	
	cursor: pointer;
	box-shadow:
		inset 0 0 3vmin rgba(black, 0.2),
		0 0 6vmin rgba(lighten(map-get($colors-blue, 100), 20%), 0.75);
	
	color: map-get($colors-blue, 100);
	
	transition: box-shadow 0.3s;
	
	span { 
		color: rgba(white, 0.7); 
	}
	
	&:hover,
	&.is-active {
		box-shadow:
			inset 0 0 3vmin rgba(black, 0.3),
			0 0 6vmin rgba(lighten(map-get($colors-blue, 100), 20%), 1);
			
		span { color: white; }
	}
}

.logo {
	top: 5vmin;
	right: 5vmin;
	
	font-family: 'ATC Timberline';
	color: map-get($colors-purple, 200);
	text-transform: uppercase;
	font-size: 2.6vmin;
	line-height: 1;
}

.minutes,
.hours {
	top: 5vmin;
	bottom: 5vmin;
	width: 25vmin;
}

.minutes { right: 26vmin; }
.hours { left: 5vmin; }
.unites, .dizaines { width: calc(50% - 1vmin); }
.unites { right: 0; }
.dizaines { left: 0; }

.hours {
	&:before {
		top: 50%;
		right: -1.3vmin;
		
		display: block;
		margin-top: -2vmin;
		width: 0.8vmin;
		height: 4vmin;
		
		background: map-get($colors-purple, 100);
		
		content: '';
	}
}

.number {
	width: 100%;
	height: 16.5vmin;
	
	color: map-get($colors-yellow, 100);
	
	font-size: 12vmin;
	line-height: 16vmin;
	
	&.is-active { 
		animation: zIndexUp 0.5s forwards;
	}
	
	&.outgoing { 
		animation: zIndexDown 0.5s forwards;
	}
}

@-webkit-keyframes zIndexUp {
	0% { z-index: 1; }
	100% { z-index: 2; }
}

@-moz-keyframes zIndexUp {
	0% { z-index: 1; }
	100% { z-index: 2; }
}

@-ms-keyframes zIndexUp {
	0% { z-index: 1; }
	100% { z-index: 2; }
}

@keyframes zIndexUp {
	0% { z-index: 1; }
	100% { z-index: 2; }
}

@-webkit-keyframes zIndexDown {
	0% { z-index: 2; }
	100% { z-index: 1; }
}

@-moz-keyframes zIndexDown {
	0% { z-index: 2; }
	100% { z-index: 1; }
}

@-ms-keyframes zIndexDown {
	0% { z-index: 2; }
	100% { z-index: 1; }
}

@keyframes zIndexDown {
	0% { z-index: 2; }
	100% { z-index: 1; }
}

.up, 
.down {
	width: 100%;
	height: calc(50% - 1px);
	overflow: hidden;

	background: map-get($colors-purple, 200);
	border-radius: 0.7vmin;
	
	transform-style: preserve-3d;
	backface-visibility: hidden;
	transition: none;
	
	&:before {
		position: absolute;
		z-index: 1;
		
		display: block;
		width: 100%;
		height: 100%;
		
		content: '';
		
		transition: opactiy 0.25s;
	}
}

.up { 
	top: 0; 
	transform-origin: bottom center;
	
	&:before {
		bottom: 0;
		background: linear-gradient(to top, rgba(black, 0.5), transparent);
	}
	
	.digit { line-height: 15vmin; }
}

.down { 
	bottom: 0; 
	transform: perspective(100vmin) rotateX(180deg);
	transform-origin: top center;
	
	&:before {
		top: 0;
		background: linear-gradient(to bottom, rgba(black, 0.5), transparent);
	}
	
	.digit { 
		bottom: 0; 
		line-height: 18vmin;
	} 
}

.digit { width: 100%; }

.is-active {
	.up:before,
	.down:before { opacity: 0; }
	
	.down {
		transform: perspective(100vmin) rotateX(0deg);
		transition: transform 0.5s;
	}
}

.outgoing {
	.up {
		transform: perspective(100vmin) rotateX(-180deg);
		transition: transform 0.5s;
	}
	
	.down {
		transform: perspective(100vmin) rotateX(0deg);
		transition: transform 0.5s;
	}
}

.knob {
	top: 50%;
	right: -4vmin;
	
	width: 3vmin;
	height: 15vmin;
	
	background: map-get($colors-beige, 100);
	border-radius: 0 1vmin 1vmin 0;
	
	transform: translateY(-50%);
}

.knob-lines {
	top: 50%;
	right: -3vmin;
	
	transform-style: preserve-3d;
	backface-visibility: hidden;
	
	transform: translateY(-50%);
}

.knob-line {
	margin: 0.75vmin 0;
	width: 2.6vmin;
	height: 0.25vmin;
	
	background: map-get($colors-purple, 200);
}
!

JS 

              
                function startTime() {
    var today=new Date();
    var h=today.getHours();
    var m=today.getMinutes();
		var ampm = h >= 12 ? 'pm' : 'am';
		h = h % 12;
  	h = h ? h : 12; // the hour '0' should be '12'
		h = String(checkTime(h)).split('');
    m = String(checkTime(m)).split('');

	// let's clear the old outgoing
	var oldOutgoing = document.querySelectorAll('.outgoing');
	var i;
	for (i = 0; i < oldOutgoing.length; i++) {
			oldOutgoing[i].className = 'number';
	}
	
	// let's get minutes going
	var minutesDizainesOutgoingId = m[0] - 1 === -1 ? 5 : m[0] - 1;
	var minutesDizainesOutgoing = document.getElementById('minutes-dizaines-' + minutesDizainesOutgoingId);
	var minutesDizaines = document.getElementById('minutes-dizaines-' + m[0]);
	
	var minutesUnitesOutgoingId = m[1] - 1 === -1 ? 9 : m[1] - 1;
	var minutesUnitesOutgoing = document.getElementById('minutes-unites-' + minutesUnitesOutgoingId);
	var minutesUnites = document.getElementById('minutes-unites-' + m[1]);
	
	minutesDizaines.className = 'number is-active';
	minutesDizainesOutgoing.className = 'number outgoing';
	minutesUnites.className = 'number is-active';
	minutesUnitesOutgoing.className = 'number outgoing';
	
	// clear outgoing 
	
	// let's get hours going
	var hoursDizainesOutgoingId = h[0] - 1 === -1 ? 1 : h[0] - 1;
	var hoursDizainesOutgoing = document.getElementById('hours-dizaines-' + hoursDizainesOutgoingId);
	var hoursDizaines = document.getElementById('hours-dizaines-' + h[0]);
	
	var hoursUnitesOutgoingId = h[1] - 1 === -1 ? 9 : h[1] - 1;
	var hoursUnitesOutgoing = document.getElementById('hours-unites-' + hoursUnitesOutgoingId);
	var hoursUnites = document.getElementById('hours-unites-' + h[1]);
	
	hoursDizaines.className = 'number is-active';
	hoursDizainesOutgoing.className = 'number outgoing';
	hoursUnites.className = 'number is-active';
	hoursUnitesOutgoing.className = 'number outgoing';
	
	// am pm
	document.getElementById('ampm').innerHTML = '<span>' + ampm + '</span>';
	
	var t = setTimeout(function(){startTime()}, 500);
}

function checkTime(i) {
    if (i<10) {i = "0" + i};  // add zero in front of numbers < 10
    return i;
}

startTime();

// get the seconds rolling
var today=new Date();
var s=today.getSeconds();
var secondsElement = document.getElementById('seconds');

secondsElement.style.webkitAnimation = 'secondsTick 60s ' + -s + 's infinite linear'; 
// apparently webkiteAnimationDelay doesn't work properly, i'm probably missing something but this seems to fix it
secondsElement.style.webkitAnimationPlayState = 'running';

secondsElement.style.mozAnimationDelay = -s + 's';
secondsElement.style.mozAnimationPlayState = 'running';

secondsElement.style.msAnimationDelay = -s + 's';
secondsElement.style.msAnimationPlayState = 'running';

secondsElement.style.animationDelay = -s + 's';
secondsElement.style.animationPlayState = 'running';

// get the audio player going
var radio = document.createElement("AUDIO");
radio.setAttribute("src","http://blobfolio.com/codepenfiles/atc-flip-clock/390917_AhWilderness.mp3");
radio.setAttribute("id", "radio-player");
radio.setAttribute("loop", "true");
radioBtn = document.getElementById("radio-btn");

radioBtn.addEventListener("click", function(){
	if((' ' + radioBtn.className + ' ').indexOf(' is-active ') > -1){
		radioBtn.className = "btn radio-btn";
		radio.muted = true;
	}
	
	else {
		radioBtn.className = "btn radio-btn is-active";
		radio.play();
		radio.muted = false;
	}
});
!
999px

Console