body {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    /* 要有 height 上面 center 才有用 */
    height: 100vh;
    background-color: rgb(4, 4, 32);
    margin: 0;
}

.date-display {
    color: white;
    font-size: 2rem;
    margin-bottom: 10px;
}

.time-display {
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-size: 6rem;
    margin-bottom: 20px;
}

.time-display div {
    padding: 0 5px;
}

.ampm-display {
    color: white;
    font-size: 1.5rem;
    margin-top: 10px;
}

.clock {
    /* 為了放 labels，改為 relative */
    position: relative;
    height: 300px;
    width: 300px;
    border-radius: 50%;
    border: solid 5px rgb(145, 188, 237);
    margin-bottom: 20px;
}

#seconds-hand {
    /* seconds-hand 在 clock 底下*/
    position: absolute;
    height: 130px;
    width: 2px;
    background-color: rgb(187, 232, 232);
    /* width/2 */
    left: 150px;
    bottom: 150px;
    opacity: 50%;
    transform-origin: 0 100%;
}

#minutes-hand {
    /* seconds-hand 在 clock 底下*/
    position: absolute;
    height: 100px;
    width: 2px;
    background-color: aqua;
    /* width/2 */
    left: 150px;
    bottom: 150px;
    opacity: 50%;
    transform-origin: 0 100%;
}

#hours-hand {
    /* seconds-hand 在 clock 底下*/
    position: absolute;
    height: 80px;
    width: 2px;
    background-color: aqua;
    /* width/2 */
    left: 150px;
    bottom: 150px;
    opacity: 50%;
    transform-origin: 0 100%;
}

#center {
    position: absolute;
    width: 10px;
    height: 10px;
    border-radius: 5px;
    background-color: rgb(34, 68, 220);
    left: 145px;
    bottom: 145px;
}

.line {
    position: absolute;
    width: 2px;
    height: 10px;
    background-color: rgb(145, 188, 237);
    transform-origin: 0 140px;
    left: 150px;
    bottom: 280px;
}

.hour {
    position: absolute;
    width: 2px;
    height: 15px;
    background-color: white;
    /* 這會讓圓的直徑更大 */
    transform-origin: 0 145px;
    left: 150px;
    bottom: 280px;
}