html, body {
  height: 100%;
}

body {
  background: #0f3854;
  background: radial-gradient(ellipse at center, #0a2e38 0%, #000000 70%);
  background-size: 100%;
}

p {
  margin: 0;
  padding: 0;
}

#clock {
  font-family: "Share Tech Mono", monospace;
  color: #ffffff;
  text-align: center;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  color: #daf6ff;
  text-shadow: 0 0 20px #0aafe6, 0 0 20px rgba(10, 175, 230, 0);
}
#clock .time {
  letter-spacing: 0.05em;
  font-size: 80px;
  padding: 5px 0;
}
#clock .date {
  letter-spacing: 0.1em;
  font-size: 24px;
}
#clock .text {
  letter-spacing: 0.1em;
  font-size: 12px;
  padding: 20px 0 0;
}          

            var clock = new Vue({
    el: '#clock',
    data: {
        time: '',
        date: ''
    }
});

var week = ['SUN', 'MON', 'TUE', 'WED', 'THU', 'FRI', 'SAT'];
var timerID = setInterval(updateTime, 1000);
updateTime();
function updateTime() {
    var cd = new Date();
    clock.time = zeroPadding(cd.getHours(), 2) + ':' + zeroPadding(cd.getMinutes(), 2) + ':' + zeroPadding(cd.getSeconds(), 2);
    clock.date = zeroPadding(cd.getFullYear(), 4) + '-' + zeroPadding(cd.getMonth()+1, 2) + '-' + zeroPadding(cd.getDate(), 2) + ' ' + week[cd.getDay()];
};

function zeroPadding(num, digit) {
    var zero = '';
    for(var i = 0; i < digit; i++) {
        zero += '0';
    }
    return (zero + num).slice(-digit);
}