JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://cdnjs.cloudflare.com/ajax/libs/moment.js/2.0.0/moment.min.js"></script>
<div id="clock" class="light">
    <div class="display">
        <div class="weekdays"></div>
        <div class="ampm"></div>
        <div class="digits"></div>
    </div>
</div>

CSS

/*-------------------------
	Simple reset
--------------------------*/


*{
	margin:0;
	padding:0;
}


/*-------------------------
	General Styles
--------------------------*/


html{
	background:url('../img/bg.jpg') #dbe4e6;
	overflow:hidden;
}

body{
	font:15px/1.3 Arial, sans-serif;
	color: #4f4f4f;
	z-index:1;
}

a, a:visited {
	outline:none;
	color:#389dc1;
}

a:hover{
	text-decoration:none;
}

section, footer, header, aside{
	display: block;
}


/*-------------------------
	The clocks
--------------------------*/

#clock{
	width:180px;
	padding:20px;
	margin:100px auto 30px;
	position:relative;
}

#clock:after{
	content:'';
	position:absolute;
	width:200px;
	height:10px;
	border-radius:100%;
	left:50%;
	margin-left:-100px;
	bottom:1px;
	z-index:-1;
}


#clock .display{
	text-align:center;
	padding: 20px 10px 10px;
	border-radius:3px;
	position:relative;
	height: 27px;
}


/*-------------------------
	Light color theme
--------------------------*/


#clock.light{
	background-color:#f3f3f3;
	color:#272e38;
}

#clock.light:after{
	box-shadow:0 4px 10px rgba(0,0,0,0.15);
}

#clock.light .digits div span{
	background-color:#272e38;
	border-color:#272e38;	
}

#clock.light .digits div.dots:before,
#clock.light .digits div.dots:after{
	background-color:#272e38;
}

#clock.light .alarm{
	background:url('../img/alarm_light.jpg');
}

#clock.light .display{
	background-color:#dddddd;
	box-shadow:0 1px 1px rgba(0,0,0,0.08) inset, 0 1px 1px #fafafa;
}


/*-------------------------
	Dark color theme
--------------------------*/


#clock.dark{
	background-color:#272e38;
	color:#cacaca;
}

#clock.dark:after{
	box-shadow:0 2px 5px rgba(0,0,0,0.3);
}

#clock.dark .digits div span{
	background-color:#cacaca;
	border-color:#cacaca;	
}

#clock.dark .alarm{
	background:url('../img/alarm_dark.jpg');
}

#clock.dark .display{
	background-color:#0f1620;
	box-shadow:0 1px 1px rgba(0,0,0,0.08) inset, 0 1px 1px #2d3642;
}

#clock.dark .digits div.dots:before,
#clock.dark .digits...

JavaScript

$(function () {

    // Cache some selectors

    var clock = $('#clock'),
        alarm = clock.find('.alarm'),
        ampm = clock.find('.ampm');

    // Map digits to their names (this will be an array)
    var digit_to_name = 'zero one two three four five six seven eight nine'.split(' ');

    // This object will hold the digit elements
    var digits = {};

    // Positions for the hours, minutes, and seconds
    var positions = [
        'h1', 'h2', ':', 'm1', 'm2', ':', 's1', 's2'];

    // Generate the digits with the needed markup,
    // and add them to the clock

    var digit_holder = clock.find('.digits');

    $.each(positions, function () {

        if (this == ':') {
            digit_holder.append('<div class="dots">');
        } else {

            var pos = $('<div>');

            for (var i = 1; i < 8; i++) {
                pos.append('<span class="d' + i + '">');
            }

            // Set the digits as key:value pairs in the digits object
            digits[this] = pos;

            // Add the digit elements to the page
            digit_holder.append(pos);
        }

    });

    // Add the weekday names

    var weekday_names = 'Mo Tu We Th Fr Sa Su'.split(' '),
        weekday_holder = clock.find('.weekdays');

    $.each(weekday_names, function () {
        weekday_holder.append('<span>' + this + '</span>');
    });

    var weekdays = clock.find('.weekdays span');


    // Run a timer every second and update the clock

    (function update_time() {

        // Use moment.js to output the current time as a string
        // hh is for the hours in 12-hour format,
        // mm - minutes, ss-seconds (all with leading zeroes),
        // d is for day of week and A is for AM/PM

        var now = moment().format("hhmmssdA");

        digits.h1.attr('class', digit_to_name[now[0]]);
        digits.h2.attr('class', digit_to_name[now[1]]);
        digits.m1.attr('class', digit_to_name[now[2]]);
        digits.m2.attr('class',...