#clock {
    border-top: 1px solid black;
    background: white;
    border-bottom: 1px solid black;
    font-size: 3em;
    text-align: center;
    padding: 10px;
}

#current_date {
    font-size: 0.3em;
}

#time_left {
    font-size: 0.3em;
    color: gray;
}