@import url('https://fonts.googleapis.com/css?family=Roboto+Slab');

        html, body {
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
            background: #141414;
        }

        #clock {
            position: absolute;
            top: 0;
            bottom: 0;
            left: 50%;
            right: 0;
            margin: auto;
            margin-left: -465px;
            width: 930px;
            height: 200px;
            text-align: center;
        }

        .num {
            position: relative;
            display: inline-block;
            width: 140px;
            height: 200px;
            font: 140px 'Roboto Slab', sans-serif;
            color: #404040;
            background: rgba(90, 90, 90, 1);
            border: solid 3px #404040;
            box-sizing: border-box;
            border-radius: 18px;
        }

        .colon {
            position: relative;
            display: inline-block;
            font: 140px 'Roboto Slab', sans-serif;
            top: -60px;
            left: -2px;
            color: #404040;
        }

        .base span {
            position: absolute;
            display: block;
            width: 100%;
        }

        .upper {
            position: absolute;
            width: 100%;
            height: 50%;
            background: linear-gradient(0deg, rgba(200, 200, 200, 1), rgba(255, 255, 255, 1) 15%);
            border-radius: 15px 15px 0 0;
            box-shadow: inset 0 1px 8px rgba(0, 0, 0, .1);
            overflow: hidden;
            border-bottom: solid 1px rgba(0, 0, 0, .5);
            box-sizing: border-box;
        }

        .lower {
            position: absolute;
            top: 50%;
            width: 100%;
            height: 50%;
            background: linear-gradient(180deg, rgba(200, 200, 200, 1), rgba(255, 255, 255, 1) 15%);
            border-radius: 0 0 15px 15px;
            box-shadow: inset 0 -3px 5px rgba(0, 0, 0, .2);
            overflow: hidden;
            border-top: solid 1px #ddd;
            box-sizing: border-box;
        }

        .lower span {
            position: relative;
            top: -100%;
        }