.flipclock {
    display: flex;
    justify-content: center;
    padding: 40px;
    box-sizing: border-box;
}

.flipclock * {
    box-sizing: inherit;
}

.leaf {
    display: flex;
    flex-direction: column;
    margin: 0 4px;
    perspective: 300px;
}

.leaf::after {
    content: attr(data-label);
    position: absolute;
    top: 100%;
    left: 50%;
    margin-top: 8px;
    transform: translateX(-50%);
    color: #f2f2f2;
    font-size: 14px;
    font-weight: 400;
    text-transform: uppercase;
    opacity: 0.5;
}

.top,
.bottom,
.leaf-front,
.leaf-back {
    position: relative;
    display: block;
    height: 64px;
    width: 120px;
    background-color: #f2f2f2;
    color: #2d3748;
    overflow: hidden;
    border-color: #2d3748;
}

.top span,
.bottom span,
.leaf-front span,
.leaf-back span {
    position: absolute;
    left: 50%;
    width: 100%;
    height: 128px;
    text-align: center;
    font-family: "Impact", sans serif;
    font-size: 80px;
    line-height: 128px;
    transform: translateX(-50%);
}

.leaf._3-digits .top,
.leaf._3-digits .bottom,
.leaf._3-digits .leaf-front,
.leaf._3-digits .leaf-back {
    width: 148px;
}

.top,
.leaf-front {
    border-top-left-radius: 6px;
    border-top-right-radius: 6px;
    margin-bottom: 1px;
    border-bottom-style: solid;
    border-bottom-width: 1px;
}

.top span,
.leaf-front span {
    top: 0;
}

.leaf-front {
    position: absolute;
    z-index: 10;
}

.bottom,
.leaf-back {
    border-bottom-left-radius: 6px;
    border-bottom-right-radius: 6px;
    border-top-style: solid;
    border-top-width: 1px;
}

.bottom span,
.leaf-back span {
    bottom: 0;
}

.leaf-back {
    position: absolute;
    top: 64px;
    z-index: 10;
}

@media screen and (max-width: 600px) {
    .flipclock {
        padding: 6.6666666667vw;
    }

    .leaf {
        margin: 0 0.6666666667vw;
    }

    .leaf::after {
        margin-top: 1.3333333333vw;
        font-size: 2.3333333333vw;
    }

    .top,
    .bottom,
    .leaf-front,
    .leaf-back {
        height: 10.6666666667vw;
        width: 20vw;
    }

    .top span,
    .bottom span,
    .leaf-front span,
    .leaf-back span {
        height: 21.3333333333vw;
        font-size: 13.3333333333vw;
        line-height: 21.3333333333vw;
    }

    .leaf._3-digits .top,
    .leaf._3-digits .bottom,
    .leaf._3-digits .leaf-front,
    .leaf._3-digits .leaf-back {
        width: 24.6666666667vw;
    }

    .top,
    .leaf-front {
        border-top-left-radius: 1vw;
        border-top-right-radius: 1vw;
    }

    .bottom,
    .leaf-back {
        border-bottom-left-radius: 1vw;
        border-bottom-right-radius: 1vw;
    }

    .leaf-back {
        top: 10.6666666667vw;
    }
}

.leaf-front {
    transform-origin: bottom center;
    transform: rotateX(0deg);
    transform-style: preserve-3d;
    transition-delay: 0.3s;
}

.leaf-back {
    transform-origin: top center;
    transform: rotateX(90deg);
    transform-style: preserve-3d;
    transition-delay: 0s;
}

.bottom::before {
    content: "";
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 0%;
    background: #000;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.8) 0%, rgba(0, 0, 0, 0) 100%);
    filter: blur(10px);
}

.flip .leaf-front {
    transform: rotateX(-90deg);
    transition: transform 0.3s ease-in, background-color 0.3s ease-in, color 0.3s ease-in;
    transition-delay: 0s;
    color: #000;
    background-color: #737373;
}

.flip .leaf-back {
    transform: rotateX(0deg);
    transition: transform 0.3s ease-in, background-color 0.3s ease-in, color 0.3s ease-in;
    transition-delay: 0.3s;
}

.flip .bottom::before {
    transition: height 0.3s ease-in-out;
    transition-delay: 0.15s;
    height: 100%;
}