body {
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: #f5f5f5;
    font-family: "Courier New", monospace;
}

#clock {
    font-size: 10vw;
    color: #333;
    font-weight: bold;
    padding: 20px 40px;
    border: 3px solid #333;
    letter-spacing: 0.1em;
}

#ampm {
    display: block;
    font-size: 3vw;
    text-align: center;
    margin-top: 10px;
}