Countdown Clock HTML CSS and JS

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HTML

<div id="countdown">
<div id='tiles'></div>
<div class="labels">
<li>Days</li>
<li>Hours</li>
<li>Mins</li>
<li>Secs</li>
</div>
</div>

CSS

body{
font: normal 13px/20px Arial, Helvetica, sans-serif; word-wrap:break-word;
color: #eee;
background: #353535;
}
#countdown{
width: 465px;
height: 112px;
text-align: center;
background: #222;
background-image: -webkit-linear-gradient(top, #222, #333, #333, #222);
background-image: -moz-linear-gradient(top, #222, #333, #333, #222);
background-image: -ms-linear-gradient(top, #222, #333, #333, #222);
background-image: -o-linear-gradient(top, #222, #333, #333, #222);
border: 1px solid #111;
border-radius: 5px;
box-shadow: 0px 0px 8px rgba(0, 0, 0, 0.6);
margin: auto;
padding: 24px 0;
position: absolute;
top: 0; bottom: 0; left: 0; right: 0;
}

#countdown:before{
content:"";
width: 8px;
height: 65px;
background: #444;
background-image: -webkit-linear-gradient(top, #555, #444, #444, #555);
background-image: -moz-linear-gradient(top, #555, #444, #444, #555);
background-image: -ms-linear-gradient(top, #555, #444, #444, #555);
background-image: -o-linear-gradient(top, #555, #444, #444, #555);
border: 1px solid #111;
border-top-left-radius: 6px;
border-bottom-left-radius: 6px;
display: block;
position: absolute;
top: 48px; left: -10px;
}

#countdown:after{
content:"";
width: 8px;
height: 65px;
background: #444;
background-image: -webkit-linear-gradient(top, #555, #444, #444, #555);
background-image: -moz-linear-gradient(top, #555, #444, #444, #555);
background-image: -ms-linear-gradient(top, #555, #444, #444, #555);
background-image: -o-linear-gradient(top, #555, #444, #444, #555);
border: 1px solid #111;
border-top-right-radius: 6px;
border-bottom-right-radius: 6px;
display: block;
position: absolute;
top: 48px; right: -10px;
}

#countdown #tiles{
position: relative;
z-index: 1;
}

#countdown #tiles > span{
width: 92px;
max-width: 92px;
font: bold 48px 'Droid Sans', Arial, sans-serif;
text-align: center;
color: #111;
background-color: #ddd;
background-image: -webkit-linear-gradient(top, #bbb, #eee);
background-image: -moz-linear-gradient(top, #bbb, #eee);
background-image: -ms-linear-gradient(top, #bbb, #eee);
background-image: -o-linear-gradient(top, #bbb, #eee);
border-top: 1px solid #fff;
border-radius: 3px;
box-shadow: 0px 0px 12px rgba(0, 0, 0, 0.7);
margin: 0 7px;
padding: 18px 0;
display: inline-block;
position: relative;
}

#countdown #tiles > span:before{
content:"";
width: 100%;
height: 13px;
background: #111;
display: block;
padding: 0 3px;
position: absolute;
top: 41%; left: -3px;
z-index: -1;
}

#countdown #tiles > span:after{
content:"";
width: 100%;
height: 1px;
background: #eee;
border-top: 1px solid #333;
display: block;
position: absolute;
top: 48%; left: 0;
}

#countdown .labels{
width: 100%;
height: 25px;
text-align: center;
position: absolute;
bottom: 8px;
}

#countdown .labels li{
width: 102px;
font: bold 15px 'Droid Sans', Arial, sans-serif;
color: #f47321;
text-shadow: 1px 1px 0px #000;
text-align: center;
text-transform: uppercase;
display: inline-block;
}

var target_date = new Date().getTime() + (1000*3600*48); // set the countdown date
var days, hours, minutes, seconds; // variables for time units

var countdown = document.getElementById("tiles"); // get tag element

getCountdown();

setInterval(function () { getCountdown(); }, 1000);

function getCountdown(){

// find the amount of "seconds" between now and target
var current_date = new Date().getTime();
var seconds_left = (target_date - current_date) / 1000;

days = pad( parseInt(seconds_left / 86400) );
seconds_left = seconds_left % 86400;

hours = pad( parseInt(seconds_left / 3600) );
seconds_left = seconds_left % 3600;

minutes = pad( parseInt(seconds_left / 60) );
seconds = pad( parseInt( seconds_left % 60 ) );

// format countdown string + set tag value
countdown.innerHTML = "<span>" + days + "</span><span>" + hours + "</span><span>" + minutes + "</span><span>" + seconds + "</span>";
}

function pad(n) {
return (n < 10 ? '0' : '') + n;
}