body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: 'Arial', sans-serif;
    background: #000; /* Change to full black */
    color: #fff;
}

.clock {
    display: flex;
    align-items: center;
}

.flip-clock {
    position: relative;
    width: 100px;
    height: 150px;
    margin: 0 10px;
    perspective: 1000px;
}

.card {
    position: absolute;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transition: transform 0.6s;
}

.card .top,
.card .bottom {
    position: absolute;
    width: 100%;
    height: 50%;
    backface-visibility: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 4em;
    background: #000; /* Change to full black */
    border: 2px solid #222;
}

.card .top {
    top: 0;
    transform-origin: bottom;
}

.card .bottom {
    bottom: 0;
    transform: rotateX(180deg);
    transform-origin: top;
}

.am-pm {
    font-size: 2em;
    margin-left: 10px;
}