.clock-container {
    width: 100%;
    color: #f9f9f9;
    background: #e4002a;
    padding: 0.15em 0;
    border-radius: 0.1em;
    text-align: center;
    font-size: 4rem;
    display: none;
}

@media (max-width:768px) {

    /* 字數較少 */
    .clock-container {
        font-size: 2rem;
    }

    /* 字數較多 */
    /* .clock-container {
        font-size: 1.6rem;
    } */
}

#timer {
    border-radius: 1.5px;
    font-weight: bold;
    margin: .5 .5em;
    padding: 0 .5em;
    letter-spacing: 0.1em;
    color: #f9f9f9;
    background: #e4002a;
}