style.css

body {
    margin: 3vmin 0;
    overflow: hidden;
}

footer {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    text-align: center;
    margin-top: 20px;
    color: gray;
}

footer a {
    text-decoration: none;
    color: #208ad2;
}

.demo-container {
    width: 100vw;
    margin: 0;
    padding: 0;
    text-align: center;
}

.demo-container.clocks.single .clock {
    height: 85vmin;
    width: 85vmin;
    padding: 0;
    margin: auto;
    border: 10px solid #424242;
}

.clock {
    border-radius: 50%;
    background: -webkit-radial-gradient(#000, #000 0.1em, #fff 0.1em, #fff), #fff;
    background: radial-gradient(#000, #000 0.1em, #fff 0.1em, #fff), #fff;
    display: inline-block;
    padding-bottom: 31.333%;
    position: relative;
    width: 31.333%;
}

.clock::after {
    display: none;
    background: red;
    border-radius: 50%;
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    -webkit-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    width: 4%;
    height: 4%;
    z-index: 10;
}

.clock.station {
    background: #fff url('images/station_clock.svg') no-repeat center;
    background-size: 95%;
    box-shadow: 0 0 1em rgba(0, 0, 0, 0.2) inset;
}

.clock.station .seconds::before {
    background: red;
    border-radius: 100%;
    content: "";
    position: absolute;
    top: -15%;
    left: -342%;
    height: 23.98765%;
    width: 800%;
}

.minutes-container, .hours-container, .seconds-container {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    opacity: 0;
}

.seconds {
    background: red;
    width: 1.25%;
    height: 42%;
    position: absolute;
    left: 49.39%;
    top: 20%;
    -webkit-transform-origin: 50% 71%;
    -ms-transform-origin: 50% 71%;
    transform-origin: 50% 71%;
    z-index: 8;
}

.minutes {
    background: #000;
    width: 4.2%;
    height: 55%;
    position: absolute;
    left: 48.1%;
    top: 6.95%;
    -webkit-transform-origin: 50% 78.5%;
    -ms-transform-origin: 50% 78.5%;
    transform-origin: 50% 78.5%;
}

.hours {
    background: #000;
    width: 3.5%;
    height: 40%;
    position: absolute;
    left: 48.25%;
    top: 22%;
    -webkit-transform-origin: 50% 71%;
    -ms-transform-origin: 50% 71%;
    transform-origin: 50% 71%;
}

article div div, article div div:before {
    box-shadow: 0 0 5px 0px rgba(0, 0, 0, 0.05);
}