.flip-clock-container {
    direction: ltr;
    font-family: Arial;
    padding: 0;
    margin: 0;
    list-style: none;
    box-sizing: border-box;
    --flip-bg-color: #1B1B1B;
    --flip-text-color: #fff;
    --flip-dots-color: #333;
    display: flex;
    justify-content: center;
    flex-direction: row-reverse;
}

.flip-clock-container * {
    padding: 0;
    margin: 0;
    list-style: none;
    box-sizing: border-box;
}

.flip-clock-container *::before, .flip-clock-container *::after {
    box-sizing: border-box;
}

.flip-clock-container [class|=flip-item] {
    display: flex;
    flex-direction: row-reverse;
}

.flip-clock-container [class|=flip-item]::before {
    content: ":";
    font-family: Consolas;
    font-size: 50px;
    color: var(--flip-dots-color);
    line-height: 50px;
}

.flip-clock-container [class|=flip-item]:first-child::before {
    content: none;
}

.flip-clock-container [class|=flip-item] .flip-digit {
    width: 30px;
    height: 50px;
    position: relative;
    margin: 0;
}

.flip-clock-container [class|=flip-item] .flip-digit > span {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
    perspective: 150px;
}

.flip-clock-container [class|=flip-item] .flip-digit > span::after, .flip-clock-container [class|=flip-item] .flip-digit > span::before {
    content: attr(data-digit);
    position: absolute;
    left: 0;
    width: 100%;
    height: 50%;
    font-size: 30px;
    font-weight: bolder;
    text-align: center;
    color: var(--flip-text-color);
    background-color: var(--flip-bg-color);
    overflow: hidden;
    transform-style: preserve-3d;
}

.flip-clock-container [class|=flip-item] .flip-digit > span::before {
    top: 0;
    line-height: 50px;
    border-bottom: 1px solid #000;
    -webkit-transform-origin: bottom;
    transform-origin: bottom;
}

.flip-clock-container [class|=flip-item] .flip-digit > span::after {
    bottom: 0;
    line-height: 0px;
    border-top: 1px solid #000;
    -webkit-transform-origin: top;
    transform-origin: top;
}

.flip-clock-container [class|=flip-item] .flip-digit.flipping .flip-digit-next {
    z-index: 0;
    animation: afterZIndexAnim 0.9s linear forwards;
}

.flip-clock-container [class|=flip-item] .flip-digit.flipping .flip-digit-next::before {
    animation: afterUpShadowAnim 0.9s linear forwards;
}

.flip-clock-container [class|=flip-item] .flip-digit.flipping .flip-digit-next::after {
    animation: afterFlipAnim 0.9s linear forwards, afterDownShadowAnim 0.9s linear forwards;
}

.flip-clock-container [class|=flip-item] .flip-digit.flipping .flip-digit-current {
    z-index: 1;
    animation: currentZIndexAnim 0.9s linear forwards;
}

.flip-clock-container [class|=flip-item] .flip-digit.flipping .flip-digit-current::before {
    animation: currentFlipAnim 0.9s linear forwards, currentUpShadowAnim 0.9s linear forwards;
}

.flip-clock-container [class|=flip-item] .flip-digit.flipping .flip-digit-current::after {
    animation: currentDownShadowAnim 0.9s linear forwards;
}

@keyframes afterZIndexAnim {
    0% {
        z-index: 0;
    }
    100% {
        z-index: 1;
    }
}

@keyframes currentZIndexAnim {
    0% {
        z-index: 1;
    }
    100% {
        z-index: 0;
    }
}

@keyframes afterFlipAnim {
    0% {
        transform: rotateX(180deg);
    }
    100% {
        transform: rotateX(0);
    }
}

@keyframes afterUpShadowAnim {
    0% {
        box-shadow: inset 0 -100px 20px -10px black;
    }
    100% {
        box-shadow: inset 0 0 20px -10px rgba(0, 0, 0, 0);
    }
}

@keyframes afterDownShadowAnim {
    0% {
        box-shadow: inset 0 100px 20px -10px black;
    }
    100% {
        box-shadow: inset 0 0 20px -10px rgba(0, 0, 0, 0);
    }
}

@keyframes currentFlipAnim {
    0% {
        transform: rotateX(0deg);
    }
    100% {
        transform: rotateX(-180deg);
    }
}

@keyframes currentUpShadowAnim {
    0% {
        box-shadow: inset 0 0 15px -10px rgba(0, 0, 0, 0);
    }
    50% {
        box-shadow: inset 0 -50px 25px -10px black;
    }
    100% {
        box-shadow: inset 0 -100px 25px -10px black;
    }
}

@keyframes currentDownShadowAnim {
    0% {
        box-shadow: inset 0 0 15px -10px rgba(0, 0, 0, 0);
    }
    50% {
        box-shadow: inset 0 50px 25px -10px black;
    }
    100% {
        box-shadow: inset 0 100px 25px -10px black;
    }
}