.hour-wrap:after, .minute-wrap:after {
    content: ':';
    right: -9px;
    position: absolute;
    font-size: 20px;
    top: 2px;
    -webkit-animation: hourminute-blink 2000ms ease-in both;
    animation: hourminute-blink 2000ms ease-in both;
}

@-webkit-keyframes hourminute-blink {
    0% {
        opacity: 0;
    }

    100% {
        opacity: 1;
    }
}

@keyframes hourminute-blink {
    0% {
        opacity: 0;
    }

    100% {
        opacity: 1;
    }
}


.digit {
    position: relative;
    float: left;
    width: 30px;
    height: 34px;
    background-color: #8b8b8b;
    border-radius: 5px;
    text-align: center;
    font-family: Oswald, sans-serif;
    font-size: 21px;
}

.base {
    display: block;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #FFF;
}

.flap {
    display: none;
    position: absolute;
    width: 100%;
    height: 50%;
    background-color: #b78505;
    left: 0;
    top: 0;
    border-radius: 5px 5px 0 0;
    transform-origin: 50% 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    overflow: hidden;
}

    .flap::before {
        content: attr(data-content);
        position: absolute;
        left: 50%;
    }

    .flap.front::before, .flap.under::before {
        top: 100%;
        transform: translate(-50%, -50%);
    }

    .flap.back {
        transform: rotateY(180deg);
    }

        .flap.back::before {
            top: 100%;
            transform: translate(-50%, -50%) rotateZ(180deg);
        }

    .flap.over {
        z-index: 2;
    }

    .flap.under {
        z-index: 1;
    }

    .flap.front {
        -webkit-animation: flip-down-front 300ms ease-in both;
        animation: flip-down-front 300ms ease-in both;
    }

    .flap.back {
        -webkit-animation: flip-down-back 300ms ease-in both;
        animation: flip-down-back 300ms ease-in both;
    }

    .flap.under {
        -webkit-animation: fade-under 300ms ease-in both;
        animation: fade-under 300ms ease-in both;
    }

@-webkit-keyframes flip-down-front {
    0% {
        transform: rotateX(0deg);
        background-color: #a6a6a6;
        color: #fafafa;
    }

    100% {
        transform: rotateX(-180deg);
        background-color: #797979;
        color: #fafafa;
    }
}

@keyframes flip-down-front {
    0% {
        transform: rotateX(0deg);
        background-color: #a6a6a6;
        color: #fafafa;
    }

    100% {
        transform: rotateX(-180deg);
        background-color: #797979;
        color: #fafafa;
    }
}

@-webkit-keyframes flip-down-back {
    0% {
        transform: rotateY(180deg) rotateX(0deg);
        background-color: #a6a6a6;
        color: black;
    }

    100% {
        transform: rotateY(180deg) rotateX(180deg);
        background-color: #797979;
        color: #fafafa;
    }
}

@keyframes flip-down-back {
    0% {
        transform: rotateY(180deg) rotateX(0deg);
        background-color: #a6a6a6;
        color: black;
    }

    100% {
        transform: rotateY(180deg) rotateX(180deg);
        background-color: #797979;
        color: #fafafa;
    }
}

@-webkit-keyframes fade-under {
    0% {
        background-color: #a6a6a6;
        color: black;
    }

    100% {
        background-color: #797979;
        color: #fafafa;
    }
}

@keyframes fade-under {
    0% {
        background-color: #a6a6a6;
        color: black;
    }

    100% {
        background-color: #797979;
        color: #fafafa;
    }
}

.clock {
    right: 20px;
    position: absolute;
    top: 3px;
}

    .clock .digit:nth-child(2n+2) {
        margin-right: 5px;
    }